Upgrade VS 2008 Professional-Collection of common programming errors

I currently have the 90-day trial edition of VS 2008 Professional, and I would like to know where I might find the least expensive vendor(s) for me to upgrade through. I have just returned to programming after a fifteen year hiatus, and am consequently having to relearn a whole lot, plus learn the all the new stuff on top of that.

Thus, I am not an MSDN subscriber, and that is a bit out of my range anyway at this point. Thus, I would love to have the Professional Edition of VS 2008, but the standard price is prohibitive for me. If you can point me to any deals I would be much obliged.