Unless you do a lot of business with them, and are buying something from them to boot, they pretty much all low ball you. Even when they dont, I cant really ever remember being offered much more than 60%, and they acted like they were doing you a really big favor.
I sold all my SIG's and HK's on consignment. Most of dealers at the time, only offered half or less of what I paid for the SIG's, and in the case of the HK's, basically what I paid for them new back in the 80's and 90's. That was around $350-400 for the SIG's, $475 for a P7M13, and $600 for the HK91's.
I put all of them up on consignment, and got close to what I paid for most of the SIG's, in the low $700's. The HK's, I got $975 for the P7, and a little over $2000 each for the 91's. I made almost another $2000 just on the 91's accessories, which they insisted they wanted included with the guns for the price they were offering!
In all the years Ive been doing this, I can really only think of one dealer who I felt was reasonable and actually worked with me. He was very straight forward on what he could "really" offer, and more often than not, pushed consignment. A couple of times, he even called other customers over to look at what I had, because he knew they were into the same thing, and let us work it out between us. He was no dummy, he knew where I was going to spend the money, and I spent a lot there over the years before moving away. I still make the trip back there when I do sell stuff, because I get a lot more there than I do here.
The big difference there vs here when it comes to what you get is, that area is pretty well off, and most of the guns you see in the shops are in good shape and more varied. Here, they are mostly hunting type rifles and cheaper pistols/revolvers, and many, and in some cases, most, have not been cared for and look it.
I tried selling a couple of my SIG's outright at work here, and those boys looked at me like I was crazy asking $500! Here I thought I was biting the bullet.
The only plus side here, is when you shop around, as you can come across some nice guns for a decent price. I have made out quite well in the past year on three S&W's, that would have brought half again as much or more down in a shop where I used to live.
I even got a Glock 31 at a local Gander Mountain here a few years back, for $350, and it was basically NIB. They couldnt sell it because it was a oddball/unknown caliber, and no one here wanted it. The clerk even got cocky "after" I bought it, and said good luck finding ammo for it. I just smiled at him, and told him this was my 6th 357SIG, and I had cases of factory and a boatload of reloads at home to feed it. The look on his face when I thanked him for selling the 31 so cheap, and that I basically stole it, was priceless.