£3.00 for two screws, you have more money than sense, those focers are about 20p each.
Find a supplier on ebay etc and measure some fasteners on the bike you'd like to change (screen bolts for example would probably be M5 x 20mm) then email a list of fasteners, type and dimensions to said supplier and see what price he comes up with.
Copy and paste the email to several sellers to get the best price
Just don't search for bike specific kits, you'll always pay through the nose for them