Trading them to a local dealer is likely the worst option. They will give you pennies on the dollar. Consigning them seems like a good idea if you can find a place to do that.
Craigslist and Facebook both prohibit the sale of firearms. Unfortunately Ron does as well. It would be really nice, and a valuable resource, to be able to buy and sell firearms locally on here.
Gunbroker and AuctionArms are both good options. You should not have to charge tax as an individual. You will have to pay an FFL to ship the firearms for you. There are several local guys who will do this cheaply. I can recommend one if you like.
Another option is putting up a flyer at your rod & gun club, if you belong to one. Or perhaps attend one of the swap meets at Safe Shoot or one of the other local places. Or, just give them to me and that way you won't have to worry about any hassle and you can be certain I'll give them a great home.