Just a thought for similar future endeavors....
If you're concerned that supply could run out before every eligible interested buyer gets one, you could start with everyone reserving one set only for a period of say 48 hours. After that time, if sets remain, you could allow anyone who wants to reserve another one, etc. This kind of process works well for things like group box breaks, and I think would work well here too. Doesn't sound like demand outstrips supply by too much, so shouldn't be a big deal....