Is there a way to check out a guitar to see if the price being asked is reasonable? My son found a Gibson Epiphone, model PR7ETBK for $849.95. I tried to check for a webpage at Gibson, but couldn't find anything to check for model numbers. The serial number search just said this guitar was mad around 1959, and it is brand new, so I don't get what I am doing wrong.TIA Lynne