I purchased the Trianglulations software and just tracing paper from the $ store to make my own. It saves a lot of money and I have any size of HST that I might need right on hand.
You can also go to quilt pro.com and they have triangle magic software and it is even in 1/8 increments. It is a little cheaper and you can either order it w/a cd or download for even cheaper. I want to try it also