$100 won't get you much look at these Weaver fixed powers I hear they are pretty reliable.
Weavers @ Natchez
Might try hanging out in gunshops till someone comes in trying to trade one in. I once bought a Leupold Vari-X II 3-9x40 with Butler Creek caps and rings for $125 off of a guy that was trading. Fellow was a nice guy and was a total stranger. He even accepted a check.