I appreciate the OP's sentiment, but we messed this up and we own it. Our merch store is totally separate from League itself and the transactions go through a different system. (not excusing, just explaining) We tried to gauge by the most successful products on the merch store so far, but were unprepared for how much more demand there was for MvM. That was on us and we're pretty unhappy with that. Orders are still going through and the system seems to be stabilizing, so if you haven't been successful yet and you're not yet completely done with us, you haven't missed anything.
Really sorry, folks. Everyone who says this is inexcusable is right. But we're looking to fix, not excuse.
Gotta love Magento