To clarify this a bit, we’ve got that many on order, but we won’t be getting them all at once the next time a shipment shows up (more’s the pity). I expect that we’ll continue getting ~500 at a time for the foreseeable future.
I didn’t think this through very clearly when I was putting together the display for incoming purchase quantities; we don’t have this data modeled in our system as well as we might. I’m working on a fix right now which should make things a bit more obvious.