Endurance athletes rarely buy electrolyte capsules, recovery powders and drink mixes in one large order. They buy a bottle or a box at a time and come back every few weeks, so most of the money is spent on reorders. A store with a low first-order price can still cost more over a season if each later order pays for shipping or misses its discount. The stores worth choosing are the ones that keep the fifth and sixth orders cheap.
The short answer
Hammer Nutrition ranks first for anyone who reorders the same electrolytes and fuels on a schedule, because its subscription discount is published and its bulk sizes cost less per serving. The Feed comes second for buyers who want several supplement brands and a low-cost house creatine in one cart. iHerb suits small orders, and REI Co-op, GU Energy Labs and Amazon save money under narrower conditions.
1. Hammer Nutrition
Best for: scheduled reorders of electrolytes and endurance fuels.
Hammer Nutrition sells its own fuels and supplements direct, and its Subscribe & Save program sets the discount by product type. Supplements, protein, collagen and coffee get 10% off, and fuels get 5%. Subscribers can skip, pause or cancel a delivery, and a subscription started during a sale keeps the sale price for as long as that sale runs. If a subscribed product’s price goes up, the same percentage comes off the new price.
Endurolytes, the electrolyte capsule Hammer sells in several forms, cost $24.95 for 120 capsules at time of checking in October 2026. HEED Sports Drink shows the bulk saving more clearly. The 70-serving size cost $64.95, about 93 cents a serving, while 32 servings cost $37.95, or about $1.19 each.
New customers who have never ordered direct can take 15% off a first order through an existing customer’s referral link. Hammer does not allow double discounting, so the 15% does not stack on top of a sale price.
Shipping is the weak point. Orders under $50 pay $6.95, orders from $50 to $99.99 pay $9.95, and shipping is free only above $100, including on subscription renewals.
2. The Feed
Best for: buyers who want several supplement brands, including certified ones, in a single order.
The Feed nutrition store sells supplements from Thorne, Klean Athlete, Momentous and First Endurance alongside its own house line, The Feed Lab. The cheapest item in that line is The Feed Lab Creatine Monohydrate, at $15.00 for 60 servings in October 2026, or 25 cents a serving.
Buyers who need third-party certification can shop the NSF Certified for Sport collection, which lists only certified products, including a separate NSF-listed The Feed Lab Creatine at $29.00. Feed 1st costs $99 a year and returns 5% of every purchase as Feed Cash to spend at the store.
At The Feed, Thorne and The Feed Lab “may not be eligible for promotions, discounts, or sale pricing.” So a store-wide offer may leave out the house creatine or a Thorne order.
3. iHerb
Best for: small orders that still need to ship free.
iHerb ships US orders free once they pass $30. GU asks for more than twice that before it ships free, and Hammer more than three times as much. iHerb’s Subscribe & Save takes up to 10% off with no fees, and new customers who join the email list get 25% off a first order. Some endurance food is marked down too, and ProBar Bolt energy chews were $24.01 for a 12-pack at time of checking, down from $32.01.
The endurance range has gaps. iHerb carries Honey Stinger, BPN, ProBar and Clif Bloks, but it does not sell GU, LMNT or Maurten, so a buyer who uses any of them has to place a second order somewhere else.
4. REI Co-op
Best for: mixed-brand orders of ten or more gels, bars or drinks.
At REI Co-op, an order with ten or more full-price fuel items gets 10% off those items in the cart. Bars, gels and drinks all count toward the ten, so GU, Honey Stinger, Nuun, Tailwind, Skratch Labs and SaltStick can be combined to reach it. SaltStick FastChews cost $19.95 for 60 tablets in October 2026.
Membership is a one-time $30 fee that never renews. Through November 12, 2026, buying it in the same order as an eligible $50 purchase brings a $30 bonus card, which expires 30 days after it is issued. REI calls its annual 10% member reward “typical but not guaranteed,” and the reward skips sale, clearance and discounted items. The supplements subcategory is also short, at 11 products, because REI is mainly an outdoor gear retailer.
5. GU Energy Labs
Best for: low-cost capsules from a brand that also makes the fuel.
GU Energy Labs sells three capsule supplements in its own store, with Roctane Electrolyte Capsules at $9.00, BCAA Capsules at $12.00 and Magnesium Plus Capsules at $19.00 at time of checking. One of each comes to $40.00, short of the $64 order that unlocks free shipping. Every reorder pays the same list price, because GU offers neither a subscription nor points on past orders. Size does help on Roctane drink mix, where the 24-serving canister cost $54.00, or $2.25 a serving, against $4.00 a serving in the $40.00 box of 10.
6. Amazon
Best for: buyers who already keep several Subscribe & Save deliveries running.
Amazon sets a separate Subscribe & Save discount for each product, and in Amazon’s words that discount “may change at any time.” An electrolyte or recovery product that is cheap on subscription today therefore has no fixed rate to plan a season around.
Outside sellers also offer products next to Amazon’s own stock, so it pays to check who is selling a supplement before ordering it.
Where budget stores stop saving money
A subscription discount can be smaller than the shipping it triggers. Even at the 10% supplement rate, a single bottle of Endurolytes on Hammer’s subscription saves about $2.50, while a renewal of that size pays $6.95 to ship because it falls below $100. On an order that small, the shipping charge is almost three times the discount.
Membership fees need volume as well. Feed 1st’s 5% Feed Cash covers its $99 fee only after about $1,980 of spending in a year. REI’s $30 is paid once, but after the bonus-card offer ends on November 12, the main way to win it back is a 10% reward that REI does not guarantee.
Amazon’s top subscription rate also depends on size, because it needs five subscribed products in a single delivery. One tub of electrolytes on its own subscription stays below that rate.
