Tasco company is out of business and the scopes are not worth much, maybe 20.00
I just purchased one for $300. that included a Tasco scope and see through mounts. Stock had some small scratches but was otherwise in good condition.
$50-100 w/o scope
model 151 k with scope
$650, plus scope.
$250-$350, depending on condition and the make/ type of scope.
one just sold on e-bay for $96.00
It's worth between $10 to $15 used.