How much would the BlackBerry Bold 9000 cost if I get it as an upgrade?

The question may sound a little confusing but.. I want to get a BlackBerry Bold 9000. My mom and I are already AT&T customers and my line is eligible for an upgrade (new phone). It's 199.99 if I purchase the phone online, but I wanted to know if it would be cheaper seeing as though, I'm not getting a brand new contract (I'll still be under my mom, as her additional line)...?.. the contract will remain the same with the exception of the mandatory data service fee and texting. If anyone has any idea... answers are greatly appreciated.
 
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