Dry transfers? No one. There are a few printers who still make dry transfers, but you get the pleasure of supplying the artwork--and shelling out some semi-serious cash for the privilege. (I recently had a custom sheet done at $70 for the sheet.) Water-slide decals are far more reasonable. Stan Cedarleaf advertises here, and can provide you with something that will work. Also Del Taparro (G-Scale Graphics) does vinyl lettering. Shawmut Car Shops also does vinyl and decals. I've used all three, and all do good work.
Later,
K