200-400 US Dollars
100-600 depending on specifics
New one would go for around $600. A used one, $300 - $550.
You'll need to be more specific - there are 5 pistol models that use .40 S&W rounds. They are: -Glock 22 -Glock 23 -Glock 24 -Glock 27 -Glock 35
300 USD or so
Depends on condition, accessories, etc.. Price range from 250-500
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.
No, they are different calibers. A Glock 17 is 9mm and a Glock 23 is .40 S&W. A Glock 22 magazine would fit in a Glock 23.
About 30 percent of its worth.
New in box for a basic model, $500 - $600.
Yes, the glock 23 and 32 and the 31 and 22 magazines are interchangeable.
No, the Glock 22 barrel has an outside diameter that is larger than the hole in the front of the Glock 17 slide. your safest option is to buy a Glock 22 and a 9mm conversion barrel for the 22 slide. Then with the correct magazines you could use either 9mm or .40 S&W in a single frame and slide.
It depends on the model. According the Glock website, the 27 holds 9, the Glock 23 holds 13, the Glock 22 holds 15, and the Glock 35 holds 15.