Upgrade from Protools SE
 

Anyone know if there is an upgrade from ProTools SE to a newer version? Guitar center has Protools 8 M-Powered new purchase for $249, but I was wondering if since I already have SE if there's some specific website link I can use to upgrade for a cheaper price.

Also, is there a version prior to version 8 that is pretty much just as good but less expensive?

Thanks!
Trent