Since Memorial Day I have been "rebuilding" a Honda TRX700XX. I've replaced all the plastics, a few handle bar controls, missing exhaust pieces, missing hardware all over the quad and the site that I found to have the lowest prices on everything was http://www.powersportsplus.com I probably have ordered over $400 from them and other sites would have been well over $650 so I feel I saved a lot of money.
One thing though, if your in a real rush for it I don't think I would order from them. They were a tad bit slower in filling the orders and shipping them but I wasn't in a rush for the parts because I would keep finding more and more stuff that was missing and having to make a list and reorder more parts.