try Maier Manufacturing. They should have some pretty cheap stuff. I was going to use them when helping a friend rebuild his '90 Katana. They were the cheapest aftermarket place I had found. May not be true for newer bikes though. Try searching google for "replacement stock fairings" or variations of it and you might find some small distributor slash cutting the competition to get a foothold in the market. Biggest thing is patience if you want to find the best deal.....
Happy hunting!
Happy hunting!