can anybody tell me where can i get some custom rims and wheels for a cbr600rr?

Shop on line. Put your bike manufacturers name, like Honda, and aftermarket parts in your search engine. (i.e. Honda aftermarket parts). You'll come up with a multitude of distributors and choices. Plus you'll probably get the best price if you do a little shopping around. If you find a distributor that is out of your state you don't pay state sales tax and most of these parts houses give you free shipping above a certain amount of purchase. I use J & P cycles who have foriegn and domestic pages for bikes.