i did actually buy the tractor truck electrical set and oil shocks from ebay seller bboykorea382, and were the cheapest around, but then i had a big problem in getting my money back for a Tamiya Racing Touareg that never arrived, so my advice is avoid him at all cost.
my non ebay faves are..
http://www.rcmart.com/catalog/default.php (wide range of everything)
http://www.stellamodels.net/catalog/...sort=2a&page=5 (best price for my Volvo, but limited for parts)
http://www.rcstation.com/ (good all rounder)
http://www.hobbydirekt.de/Carson/Tru...::220_231.html (rare Carson parts, but pricey and in German)