At Puritan's Pride, buy two select Puritan's Pride vitamins or supplements, and get three more for free. (Eligible items are marked; you can also buy one and get a second for free.) Plus, coupon code "PRC7V1" takes an extra 10% off. Even better, all orders qualify for free shipping. Combined, that's tied with last week's mention and among the best BOGO discounts we've seen from Puritan's Pride in recent weeks, although we saw a buy two, get four free discount combined with an extra 30% off and free shipping in July. (For further comparison, we saw a buy two, get four free discount last month, but additional discounts required a minimum purchase.) Coupon ends September 30.

A best bet is to buy 5 Puritan's Pride Vitamin D3 5000 100-Count Bottles for $19.98 before the above coupon, $17.99 after. With free shipping, that's $3.60/bottle and the lowest total price we could find in this quantity by $17.