every sporting good store, wallymart, any store that carries guns should have 870 combos and mossberg 500 combos on the shelves right now. pump combos should be around $300.
for right about that $500 mark, that stoeger m2000 semi auto combo would make a good gun, but if that is what you want, i would get on it. last year sportsmans warehouse ran out and had trouble keeping their shelves stocked
just remember rifled barrel, sabot slugs
smooth barrel, rifled slugs