If you're looking for a bargain, consider this Eberjey Cover-up. While the price is very reasonable, this product is an easy wardrobe update. It's also worth looking at this Swimsuit. This item is ultra popular and, just as importantly, not too pricey. Check out this Seafolly Swimsuit too! Great value for your money.
If you're looking at it like an investment piece, then you absolutely must check out this Anthropologie Swimsuit. This piece seems expensive, but it's top quality.