One of this biggest problems with buying bikinis, besides finding the right size, is having to buy two separate things. Even with affordable swimsuits, you wind up spending $50+ on two small pieces of fabric. Aerie wants to help you out by marking down all of their bikini tops and bottoms to just $20 each. Mix and match, get a set, or just get one to go with a top or bottom you already have. The world is your affordable oyster.