P&D Hobbies, Grosbeck at 13 mile
Empire Hobbies, Just north of Big Beaver on Rochester rd (old costellos hardware)
there is also a new one on Woodward somewhere south of 696 I think called Rainy Day Hobbies, but I don't know anything about them.
P&D is the premier shop by far lots of models and parts and supplies. Has a stock of ON30 in house also.