I don't Let It Be has ever been released on DVD - certainly not in the UK and I'm pretty sure it hasn't in the US.
So, you can pretty much gaurantee that the DVDs on eBay are bootleg copies. A word of caution though - check the format of the discs - it's available as DVD, Video Disc and few other formats and not all players can handle them... as I recently found out! DOH!
It might be worth waiting a while for the official release... and wait... and wait...