All I will say is that a plain old 22 LR really only has a range of about 50 yards and that a expensive rifle scope is not necessary for harvesting a squirrel.
My needs are that it should have one inch rings and be at least 32 mm objective with at least a 4X scope.
The low power scope will allow you a faster target acquisition and the lower magnification will compensate for parallax when you factor in the magnification power level of a Variable power scope.
The best scope in the $100 and under category would be a Bushnell Banner / Trophy or a Tasco World Class or Simmons.
If you have a real gun shop - you can walk in and just look at which scope best fits your needs. Do not go over board - because it does not take much of a scope to shoot 50 yards or less.
Use this online catalog as a benchmark of what it should cost to buy a new scope. If your local prices are not as good or if a good scope is not available locally - these people will ship it to you.
http://www.gricegunshop.com/specials/PDFs/10.19.10/2010-hunting-season.pdfI'm surprised that no one said Pentax - at $99.00 it also would be a good deal.
Just stay away from the BSA - they are junk!