Single Shot, $25 - $75 or Double Barrel, $150 - $250, depending on condition and the buyer's mood. Less if broken or rusted, a little more if like new.
Try e-gunparts.com
Assuming it is fully functional but not like-new, about $150-$200.
yes they did
next to the barrel
@ 100 USD
1837
50-100
150 USD
Depending on the condition. On average, about 100.00.
50-100
150.00 in excellent condition
Blue Book of Gun Values will help.