A few posts ago I highlighted the 2006 Fleer Greats of the Game set as a good set to get not so common certified autographs with inscriptions of low to mid level stars. If you are an autograph hound, another great set for inexpensive autos is the 1996 Leaf set. These autos were probably mass produced with thousands of copies but with great quantity comes low prices...and they are all on-card! Checkoutmycards.com has many under a $1.00.
These are three of my favorites that I've picked up from the set: