4-5 hundred
$475 - $540 used, in the vicinity of $600 new.
A Glock 20 (third generation) will retail for about $600 in good condition.
A new Glock 22 typically runs about $500. A used Glock 22 in excellent shape can range from $350 to $600. Everything really depends on the generation it is, condition (which should be perfectly fine, i mean it is a glock), if it has any extras, and if it is police issue or not. I would say a police issue in good shape would probably be worth $500-$600 easy.
200-400 depending on condition
500
100-400 USD depending on condition.
300-400 USD
Depends on condition, box, etc, but new is about $525.
300-400 USD
$350-$500, depending on condition.
350 or so
$300-$500, depending on condition.