I recently bought a Nero 6 OEM from another dealer. I paid about $10, which included $4.95 shipping so it was a different company.
As the previous poster said the OEM is limited. I haven't used it very much but I can tell you that it seems to have most of the basics for burning, because I have burned some discs and they turned out fine. However, it does not have WaveEdit. SoundTrax, BackItUp and Recode. As least I don't have on my machines. The programs ARE on the disc but when I try to launch them a message comes up to say my license doesn't permit them to be launched.
I have not fully explored all of the other features but I have used several, such as the disk info feature.