At Vitacost, buy one select item and get a second one for 50% off. (Eligible items are marked as such; the second discounted item is automatically added in-cart.) Plus, add an item to your cart via Set & Save for an extra 10% off. With prices starting at $3.48, that's tied with our mention from last month as the best discount we could find for items that qualify. Shipping starts at $4.99; get free shipping with Vitacost brand items of $25 or more or all other purchases of $49 or more.

A best bet is the Vitacost Synergy Once Daily Multi-Vitamin (pictured) for $19.99. Add one to your cart via Set & Save and you'll get a pair for $27.98. With free shipping, that's $12 off and the lowest total price we could find for the pair.