Depends on the pawn shop, I've found. Some are in it to make a buck and turn inventory. Some will sit on a piece for DECADES waiting for the perfect sucker. We've got one here in town that asks $15 for unreadable 90% halves and will not come down a PENNY. He's got a pellet gun in there that I KNOW is a $100 piece at best that has been on the shelf since I started college in 1997. Priced at $699.
That said, a few towns over there was a shop that for whatever reason had a stack of 1988 krugerands in the case about the size of a pop can. Asked the price, and they offered to sell me two at about 20% BELOW spot (circa 2006).