Maybe I've just been lucky,but I've bought a flat back 110FLP & 12FLVSS,and also a newer 12FLV w/Accu-trigger over the last couple years,and didn't give more than $400 for any of them.
The flat back's were barely shot by the look of the bores,and the 12FLV probably didn't have a box of ammo shot out of it.