a lot of YT members have their own stores and sell them for inexpensive too! and they are really cute.. just to name a few
www.barkindogclothes.com www.imapreciouspup.com www.furbabyboutique.com
if you go to the products and reviews section, the first thread on there is a sticky with all the online stores that sell furbaby clothes
here is the link
http://www.yorkietalk.com/forums/showthread.php?t=12018