I have also taken a class at Spun Sugar in Berkeley. The shop is small, but they do have some good things. I've also taken a couple of classes at The Cakeworks in San Jose. I found both shops to be pretty pricey and they usually don't have what I want.
I'd really like to open a cake decorating supply shop, but I checked with a realtor today about the cost of leasing space and the rent around here seems to be between $3,000 and $9,000 a month which is just more than that kind of store can support, I think. It explains why prices seem high,
If they have to pay rents like that, no wonder!
Anyway, I called Linton Paper and Supply in San Leandro and they sent me catalogs for 4 companies they represent. They are very old-fashioned and don't have a website, but they have lots and lots of cake decorating supplies from Caljava, Bakery Crafts, DecoPac, Lucks and more. They are not a "store", so you can't "shop", but you can call them and make a phone order or you can fax. Mostly you just have to ask if they have what you want. If you have a tax ID and a business license, they will sell to you at wholesale prices. Otherwise, they'll sell to you, but at retail. You just call and tell them what you want and they'll have it ready to pick up, or if you have a commercial address and order more than $150.00 at a shot they will deliver, or they will ship if you want to pay shipping (but it is local, rather than cross country shipping if you are in the Bay Area, so it should be less costly)
That's all I know, but I'd sure like to hear more! Are any of you members of the Fremont Frosters cake club? I've been meaning to get to a meeting and join, but haven't made it yet.