A Mossberg 500ABR shotgun I picked up for $150 at a pawnshop...it's got a bit of wear, as it's obviously been someone's ranch gun (stock has significant wear that does not look like abuse and some speckles of rust in some areas), but other than that seems to be in good condition. It has a 28" modified choke rib-vent barrel (integrated choke). It should be decent for trap/skeet and possibly some bird hunting.
It'll be my intro to the world of shotguns. I figured it was either this or an H&R for the price, so this shotgun won out.