I have a 637 pro, ported that I took in to Gander Mountain to possibly trade. The clerk told me they could only get $290 for it RETAIL! Where have you ever seen a slightly used smith for that price?!? I didn't even ask how much they would give me for it, I was laughing too hard. I know if I traded it in and stopped in the store the next day it would have been tagged with a much higher price. This model has been discontinued, how can I find what it's really worth? I've seen them new going for about $600.