LGS has a used blued Delta elite built in 1988.

90%+ condition. Light idiot scratch and very minor bluing wear on the trigger. The rest looks immaculate.

How much do you think it's worth?

Based on GB ‘actual sale’ pricing for a production blue DE in the condition you described, likely $1000-$1100.

In a LGS, what you can get it for will depend on (1) whether it’s a consignment sale and whether the consigner is willing to reduce/negotiate a deal below the white tag price, or  (2) if the LGS bought it or took it in on trade, how bad they want to move it. If it’s been sitting on the pre-owned shelf a while, they’ll be more open to an offer.