The other thing I think I'm going to do to it is make it into a convertible tankini by making the bottom part of a tank top and adding hooks to it, and thread loops to the inside of the top to attach it. This way, I can be covered on my fat days and bikini-clad on my confident days (the days when the pool is empty!).
I don't know what to put the cost of the bra at--I think it was about $12 new, but that was a long time ago. The material was WM clearance $1/yd, and I used less than 1/4 yd. But let's call it $.25. And that's it!