I'd keep an eye out for some specials... CompUSA was offering the T-Mobile SDA for $50, after $50 T-Mobile rebate and some other instant rebates/discounts that allowed you to renew the phone. They may have also had the RAZR, not sure.

On a personal note, I was out of contract for my T-mo Blackberry and got the special at CompUSA. I wound up with the SDA for $50 after rebate, and kept my number, plus only had to do 1 year renewal.

You may want to go to www.fatwallet.com where I saw a few posts about deals on RAZR's... though I cannot say I actually read the details of it. Do a search on that site.

I also agreee w/ ScottC's recommendation on not messing with porting numbers and such. I know someone who told me there is a "trick" or "method" to switch back and forth between carriers to get the best deal and maintain your number, but he said it required willing participants from both carriers and may be at risk of losing the number regardless due to the computer system pulling the numbers back into service, beyond the control of the rep.

Good luck!