Yeah, buy them directly from Slysoft.com. If you go through another website, then chances are you are buying somebody elses copies of the activation keys (which isn't a good idea if you want updates as they come out).
Also DVD 43 (DVD for free) and DVD Shrink are a good combination--they are both free programs. DVD Decryptor was awesome, but there will never be anymore updates for it. AnyDVD and Clone DVD2 are good programs to have. Good luck.
Phil