Yeah, they sure did get a good response, and it turns out I didn't order the huge surplus that I'd previously imagined. I actually had to fill in some series discs into the payouts in order to keep a few of the ZAM stamps around.
There's actually more significance to the stamp than just being cool. A lady who has been trying her hardest to get the course taken out has frequently cited the pileated woodpecker as being a candidate species and claims that we're disturbing their habitat. The fact of the matter is that the pileated woodpecker population is growing pretty much across the board, and the woodpeckers hang out on our fairways, totally unconcerned about discs flying by. So, this stamp is a bit of a "thppppppt" to the enemies of the course.
But yeah, I had pros coming through, all butt hurt that they didn't get a players pack with one of the discs, and wanting to buy them before I'd even sorted them into payouts.