Irulan, I can only find a SD card on newegg for the Nook COLOR, not the Nook TABLET. Everything I've been able to find on the TABLET state the bootloader is locked and signed. I state this from posts posted today on both the B&N community forum and XDA Developers forum.

Yes, the Nook COLOR can be rooted from an SD card from Newegg, but not the TABLET. If you found something else, can you provide the link?