I also use old clothing patterns to transfer quilting patterns onto. I can quilt through these and then just tear them off.
Also, If you look closely at the bottom of the Urban elementz.com page they have some free patterns you can either print off or down load digitally.
Joann's, Hobby Lobby and Hancock has some of the plastic patterns. Hancocks are especially reasonable in price, I think. I even got some that were on clearance last week for .40 cents. great deal.