At Avon, buy one select cosmetic and get 50% off a second one during its Makeup Foundation Sale. (The Discount applies in-cart.) Plus, orders of $10 or more qualify for free shipping via coupon code "SNOWY"; otherwise, shipping starts at $5.95. (If you search for an Avon representative and check out via their webpage, shipping falls to $3.) That's the first BOGO discount we've seen on cosmetics from Avon. Sales tax is added where applicable.

A best bet is to buy two Avon ExtraLasting SPF 12 Liquid Foundations in 17 shades (pictured) for $19.98 before the above discount, $14.98 after. With free shipping after the above coupon, that's $11 off and the lowest total price we could find.