The best pair of soaps you can use as a beginner pair are the express I believe. But if you want to expand your choices, go on ebay and see if you can get a pair. But right now, nothing is up on there :(
http://www.sonicandpals.com/soaps/index.htm
Go there, and click on "Buy soaps". And then just choose what pair of express you want, grey, white, or black. Until something comes up on ebay, that's all I can do for now. :)

Yep, SonicandPals.com is the way to go

The Express are a super solid shoe