First come first serve, and of course a store would always rather sell in person than having to ship. Since it's a limited item, I'm sure that's why there's no phone orders. If it was something just sitting on the shelves and bad plenty in a backroom I'm sure they wouldn't mind and you could order off the phone. Even if they did allow them to be purchased over the phone, resellers could just buy them that way as well.
Same thing when new Jordan's or Nikes come out. You can't order them over the phone.
I'll be in the parks 28th-30th. I'll be on the lookout for these bags and see if they restocked