I've also had many dealings with Don.I call him the "Don" of papermoney,sorta a take off on the godfather if you will.
He has always been fair,honest,and he stands behind his grades.With a great reputation,as you can see here,his name means a lot to him.
As for discounts,with the market this hot,and notes that have some rarity and originality being snapped up,you'd do well to accept his pricing most times.Don is not a price gouger,and stands behind his word.That's money in the bank.And unfortunately,like most of us,you'll learn the hard way that is worth a lot in collecting.