There is a site called jewelrylessons.com - free to join. As a member, you can browse their tutorials by price.
There are lots of tuts for clasps and several of them are free. The clasp that I use for most of my bracelets is from a free tutorial on that site.
Rating
Additional Sites by: Anonymous
You can also check out Beading Gem, they have loads of tutorials. And don't forget You-tube, there are so many blogs and sites out there, just type in "Handmade Clasps".