Here's a bubbler that I found on glasspipes.org.. it's pretty much sick. Bubblers usually range anywhere from $30-300 depending on the quality, materials used, intricacy, and artistry. As far as the size that you're looking for, I don't really know. You'd just have to look around, or you could make your own out of common household materials. You can search around on this site for some information on how to make your own pieces.