C.J.
You should first check out diaperswappers.com to see if there are any for sale on there... then ebay. But if you don't find what you want then you should check out these two websites. They cover the front and back:
http://www.hotslings.com/nursing_covers_2/hotslings_nursi...
http://busybabywraps.com/html/creamsicle_wrap.html
Good luck!