Originally posted by BT
Try this: http://www.apaladini.com/cioppino.html
I've never used their cioppino base, but I've used other Paladini products (especially their tarter sauce) and liked it.
Or, since you appear to be in Seattle, see http://www.larrysmarkets.com/
. This place in Seattle appears to have their own brand of cioppino base.