I was watching some prices on Guns International for rifles offered by various Cabela's Gun Libraries around the country. It's been a few years so I forget the exact time period (a month, maybe?) but if a firearm didn't sell within that time frame they'd lower the price by 9 or 10%. Then if it still didn't sell they'd lower it by another 9-10% and so on.
Watched an 1885 Traditional Hunter for a while, called the store where it was located and asked that it be sent to the local Cabela's, so it cost me $25 basically for the right to look at it. When it got there I said I'd been watching it, it hadn't sold for X amount of time, so offered them 10% less than the last listed price at the other store. The guy looked at something on his computer - most likely its price history and length of time for sale - and said okay, no problem.
'Course, that was 3-4 years ago, Bass Pro probably f'ed up that paradigm. Went into the local gun library last week and it was pathetic, they had maybe 1/10 the amount of firearms they used to display and most of those were black shotguns or rifles with a few scraggly semi-auto pistols. Shame, that, I'd bought three or four guns from them at very reasonable prices over the last several years.
