You can put Penn Valley hobby shop on the list - probably the best C/l F/F and all round hobby shop I've ever seen. They even stock FF plans and have a minimum of 50 c/l kits available and a good assortment of OS-LA, Fox Norvel and Enya Super sport engiines they have ttpro 46 also - they just sold a custom models coyote kit on ebay. I've gotten both of my custom models kits there - too bad the custom models is no longer in business.
The second best and a close second is Virginia hobby sport just outside of Washington DC. Also has a good assortment of kits and engines. This guy is so honest he'll tell you to buy the OS engines from tower because he can't beat there prices (though he tries). I got a bunch of engine parts, line sliders and flap horn boxes and tongue mufflers there.
They both sell the dare line of hobby kits as well as RSM and Brodak.
Virginia Hobby sport had an excalibur kit from Builditright hobbies
http://www.virginiahobbysport.com/index.htm
http://www.pennvalleyhobbycenter.com/oldsite/showme.htm
This is an unabashed attempt to get the word out for these guys -
Enjoy