To be clear, I was only using the G19 as a ubiquitous example, I'm not looking for one.
I recognize that some prices on Gunbroker are fairly accurate, but I find it hard to figure out which ones, especially if I'm not familiar with the gun. I'm looking at comparing amongst multiple sites to find some average. We have a good "buy and sell" (of everything) website in Idaho with what I find to be quite accurate market prices on guns, but the inventory is nowhere near the size of sites like Gunbroker, so it's hit or miss on finding a particular gun.