Just to reiterate what I said earlier, not all of the £44 ones have even been released for sale yet according to what I was told when I bought mine earlier.
As of 6pm (when I was in the ticket office buying mine), the only £44 ones you could buy were the ones on the first tier behind the goal, and the ones right at the back of the third tier on the side, that huge section of £44 ones at the front of the third tier behind the goal weren't available as they were under strict instructions to sell the other areas first. Given that is the biggest section out of the lot, I somehow don't think that they've sold all of them between 6pm & 9pm! Even more so when you consider that the queue when I left the ticket office this evening wasn't even halfway towards the door.
As for when they will be released for sale, I don't know, I can only assume it will be when the rest of the tickets have gone. I would say that I'm guessing they want to sell the first 2 tiers out before releasing the third tier for sale, but then that wouldn't explain why you can buy the ones up in the gods already.........