NateHawkHey NateHawk,
UE only had 20 units available for this drop and we generally try to keep at least one unit of each product in stock for support purposes (our office is basically a menagerie of sample units and NIB products) so unfortunately the stock ran out before the buy finished.
It's lame, and we're working on a better way to express stock limitations when they exist. It doesn't pay to wait on Massdrop but the good news is that no matter when you join, you've got the option of committing at the lowest price level so there's no cost to getting in early.
That said, I'll lobby with UE to get more units allocated for next time : )