I found my older 870 for not much more than that... 350ish I think it was. Whatever ya decide upon...
Fiocchi Defensive load 00 buck
...
Tames the recoil and patterns the 9 pellets in the shape of a football.... whether at 10, 20, 30' ... but you still gotta aim
.
A "stopper" round for sure
Good luck with the search!