Hard to pick a scope without knowing what kind of gun it will sit on, but right now Nikon scopes are on closeout everyplace because they are quitting the business.
Get a low power (for fast swinging at squirrels in .22LR), and get a smaller objective. You'll want as little parallax as possible since your shots will be close in.
Most likely you'll set it up for 40 to 50 yards at sight-in, so a large objective will have you cocking the scope too far downward to keep it accurate for the rare 80-90 yard shot.
So, 2 x 7, or a straight four power, Nikon, should run $75.00 to $125.00 right now.
SWFA SS 3-15×42 on both my squirrel rifles. Overkill? Yeah. Great scopes? Yeah!
I went with the Leupold freedom 2x7x33 with 22moa reticle