I bought a Rem. 870 Youth Mod 20ga. a couple of months ago at Gander Mountain used for $190. Not the base line model. Very Nice finish, nice wood. Gun was in Excellent shape. Also picked up a Youth Model 20 guage Mossber 500 for $170, also in excellent shape (finish was like new, just not as premium as the 870). Both shoot great.
The average price of a Remington 870 Express Magnum pump 12 gauge shotgun "brand new" is about 300-450 dollars. I got mine used for $250
This will depend on the market. Remington is a good brand of gun so you may be able to get a good price for it.
No such model in the Remington line.
Price varies depending on which version, condition.
price of a 710 model Remington rifel..
100-500 or so
The Remington Model 1100 shotgun is still in production, hence it would be worth no more than list price - and probably less, if it has been used at all.
$600 around there $600 around there