Why different HUP prices?

[wireless]

True story - last fall my boyfriend upgraded his iPhone 4 to a 4S at Future Shop in Oct 2011. Signed a new 3 year contract. I went to the same store about 2 weeks later, did the same thing, upgraded from 4 to 4S, 3 year contract. We each have regular, non business lines. On iPhone 5 release...

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