it would be worth between $45 and $65.
Depends on model and condition. Anywhere from $100-$250
The Benjamin 250 is one of three pistols that make up the 250 line of air guns. Here is how they break down: 250 is a .175 BB pistol 252 is a .22 caliber pellet pistol 257 is a .177 caliber pistol. The problem is finding .175 BB's today most all BB are .177 caliber. I've heard that BB are still .175 only the caliber of the barrel has moved up to .177 to accommodate pellets. I suggest you just try one.
$250
about 250 dollars
15-250 USD depending on specifics
Depending on condition, $250-$300.
$150-$250, depending on condition.
Without more information about the condition of the pistol it is not possible to answer you. BUT I can tell you this. In poor condition it is worth $50 in "NEW IN BOX" condition it is worth $250. "Model 805 Sportster Single Shot"
50-250 usd
$100-$250, depending on condition
25-250 USD or so