Anyone know where to get a gun rack for the rear window in a truck? I looked at stores in my local area and couldn't find any

Bass Pro, Cabelas, Academy...most of your sporting goods stores should have one. Make sure to get the suction cup ones. That's what I have and they work great. The can hold up to 100 pounds. I use to have one that cinches up into the window seal, but those would fall over on me when I would turn a corner. I have noticed that in extremely cold weather, my suction cup rack would be laying in my seat in the morning when I would get out to my truck. I don't know if it's because I have had my rack now for about 5 years and it's time to get a new one or what. However, when I put the rack back on the window, it sticks and holds just fine.