Dippin' Daisy via Amazon offers its Dippin' Daisy's Women's High-Cut Vintage One-Piece Swimsuit in 35 colors (Blue Star pictured) for $29.99 with free shipping. That's $34 off list and the lowest total price we could find, excluding the below mention. It's available in sizes S to XL, although not in all size/color combinations.

A close price: Groupon offers it in 12 colors for $26.99 plus $3.99 for shipping.