We are huge fans of Bella's Prissy Puppie Boutique on FB too! I also love checking out the YT Vendors listed on the site here. Etsy rocks too. Ebay has cute stuff as well. Ooh, and check your local Ross store. I found KS a lot of adorable sweaters there. I've even seen some cute stuff at Wal Mart and WalMart.com. I know some flea markets have booths with dog clothes now too so that may be an option for you.
Good luck!
