My housemate has a pretty cool story concerning his purchase.
Neither of us had pre-ordered the game, and for the last few days we had been considering whether to go to a midnight launch or not, and whether it would be worth it. (Being in Ireland, demand for video games isn't very high at all, or so we thought). Anyway, as he was going to be hosting a night out for some freshers in his college, he decided that he might as well give the midnight launch a shot. I decided I'd just get the PSN version, so I started downloading it.
At 1 am, my housemate bursts into my room like a spoiled child at Christmas, triumphantly holding up his copy of GTAV a la Kunta Kinte, along with a poster and a wristband. As it turned out, he went down to the nearest Gamestop at midnight. There were two massive queues coming out the door and trailing down the street. He just strolled 100 metres to a HMV store, walked right up to the cashier and asked if they had any 360 copies left. They did. The moral of the story? Shop around.