You can always offer less than the amount shown. At least gives the seller something to consider.
I am amazed at how on some of my listings, I get hundreds of views and not one offer. It seems to me that a lot of people don't want to negotiate anymore. I have sold some guns at low prices to the few that were willing to ask.
But I do agree that if you are like me and are used to making money or at the very least breaking even on firearms transactions, now would be a good time to leave it all in the safe.
I am sure if I tried to sell my Shield, I would lose somewhere around $100.