Target cuts $10 off nutrition orders of $30 or more via coupon code "HEALTH5". (Eligible items are marked.) Even better, take an extra 5% off and bag free shipping when you subscribe. (Otherwise, shipping starts around $5. In-store pickup is also available.) Some best bets, each with prices after both discounts and free shipping:
2 Hydroxycut Hardcore Capsules 60-Count Tubs for $20.38 (low by $10)
2 Market Pantry Whey Protein Powder 32-oz. Tubs in Vanilla for $26.08 (pictured, $12 off)
Shopping in-store? Bag the same dollar-off discount via a printable coupon. (Browse the Weekly Ad for your store to find it; it's on page 20.) Be sure to cancel your subscription once your order ships to avoid being billed for subsequent shipments.
Frugal isn't smart if you put off replacing these things. Waiting too long can cost money or even endanger your health.