For me, the Winchester 809
outclassed anything in the sub-$100 range, and gave the Leupold FX-1 (almost $200) a surprisingly hard run for its money.
That said, I bought a Weaver Classic Shotgun Scope
on a recommendation here (thanks, sholling
!), and I have to say: it would be a pretty fair scope at MSRP, but at its discontinued, clearance price, Natchez is practically letting you steal it. If you can scrape up the extra $30 (with shipping and insurance, my damage came to $93.73) I couldn't recommend that enough. It's parallax-set to 50 yards, same as any rimfire scope, and if it's built for a shotgun you know
it'll stand up to recoil.