To be honest, they are not that hard to get hold of at RRP, I managed to stack four last week and had the chance to double that if I wanted but didn't.
Come November, I'll be kicking myself because thats when they will be as hard to get hold of just as they were back in May/June/July.
I've got four, looking to get rid of two so I'll have two to bundle with two Wii's I've got if it all goes wrong which I doubt.