What's the most I can get from a 2-year contract?

I'm thinking about getting a blackberry. Is there any huge discount I can get by signing a 2-year contract? My current contract is about to end, and I can renew it.

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well the good thing is you dont have to have do as large of a rebate as a new customer, right now for the curve its $299.99 for the curve - $50 rebate...but remember you have that $18 upgrade fee...at least the discounts nice...

I'd recommend to get 1 year in corp store if you can
pay $50 more, but you can do upgrade twice in 2 years, that can save up to $300 over MSRP on the long run, and you can sell old one on ebay, keep as backup, or give to other family member (make sure it's unlocked)