Check the Furniture vendors in most worlds. Krokotopia is a good one for additional crafting tables. You have to use the boat like you are going to the Balance school. The furniture vendor is on the left.
Furniture vendors in Krok, Moohsu, Marleybone and Dragonspyre sell all but the Jewel station. You get that one from the quest in Wizard City or from the vendor in WC if you accidentally sell or discard it. There are also stations in Grizzleheim and Dragonspyre that are special locations you visit to craft and cannot be bought for your home.
