How much does a MyTouch Slide cost if you want to upgrade?

I have been a tmobile user for almost 22 months now, and my contact ends mid july early august. I want to upgrade my phone to the MyTouch Slide. The phone is $180 with a 2 year contact, but you $50 mail in rebate. Also, since I am upgrading after 2 years, wouldn't I also get a $50 discount? So the phone should be $80? If not then how much.How much does a MyTouch Slide cost if you want to upgrade?yes it would be exactly $80 bucks.