I saw one today on babysgotstyle:
Tuxedo Bodysuit
It's an Australian website but I've bought from them before with no probs, you get 10% off the price as it's minus GST for overseas orders and postage should be $9 which isn't too bad.
Rock Me Baby is a popular brand so you should be able to sell on TM afterwards and get most of your money back. RMB sizing is small so unless your baby is really small the 000 should be ok.