Single shot or bolt action, $50-$90. Pump or automatic, $90-$150. Double barrel, $150-$200.
50-500 USD depending on specifics
The asking price online for a used Revelation 16-gauge bolt action R316BKB is $100 to $140. The price partly depends on the condition of the gun and if anything, such as magazines, come with it.
300 or so
About $100-$150 depending on the condition!!
10-100 USD depending on specifics
how much is a noble arms 22 cal bolt action worth
have you checked with MIDWAY.COM
For a .50 BMG rifle, $3000 and up, with $3000 being just for a basic, bolt action single shot model.
$50-85, depending on condition. These were low cost shotguns (IIRC, made by Mossberg for Western Auto) but very functional hunting weapons.