We all hear of "shady" dealings going on. My take is this, if you are at a show selling guns, no matter what the gender, you should have done your homework as to value of guns. IF it is a higher quality than normal, you should have had it appraised by someone that knows them.
The other take is when a spouse dies suddenly and the widow sells the guns from the home, we have all heard of "great deals" this way, and to no fault of the widow, was usually "taken".
Like KY Jon stated, have a list of prices for someone to follow in the case of your demise.
A while back, there was a lot of controversiary over the same subject, a Parker 28 ga. Person didn't post for quite a while afterwards, from what I can remember.