Walmart is stocking them at stores (havn't seen them around here but then again I don't visit them a lot either) and online.
So far I have been only able to find Revell kits. The prices seems to be a little cheaper then Micheals/AC Moore.
http://www.walmart.com/search/search-ng.do?search_query=revell&ic=16_0&Find=Find&search_constraint=0
Store pickup is pretty easy so if you can get great deals go for it :)