Back in the late 90's and early 00's I did the same thing. We had an online record store, homebass, and we would give free records (mostly promos) to our best

Back in the late 90's and early 00's I did the same thing. We had an online record store, homebass, and we would give free records (mostly promos) to our best customers. I would also include a hand written note thanking them for their business.