After some searching I found a few budget friendly options. Victoria's Secrect has the Flirty Multi-Way Dress for $89. Designer Rachel Pally has designed a exclusive converible dress for Target. It comes in a purple print (only) for $79.99.
My personal choice is the Mossimo Multi Style Convertible dress at Target for $29.99! It comes in purple, charcoal, deep love, and ebony.
The idea of figuring out the best ways to tie the dress as well as the right bra for each style is a bit daunting. I think I can take a chance for $29.99.