Look around among different dealers, you should find several relatively easily. There are a LOT of 870s out there- some 10 million or so.
But a hint- if you wait till hunting season is over, you're more likely to have a wider choice and find better prices. At least in this neck of the woods, there are a good number of hunters who buy a shotgun for hunting season, use it for a few months and then sell it because they need the money for something else. The 'off season' is a better time for good deals around here.
OBTW- I've been shooting 870s for going on 40 years, and have yet to buy a new one.
fwiw,
lpl