I just happen to come across this while checking out Crash.net this morning. The site has tons of DVD's for sale. http://www.dukevideo.com/Bikes.aspx
Make sure to buy from their American site, which has less selection. Unless you have a player that can play other DVD formats than NTSC. England region DVDs are PAL format. Not compatable.
Their top ten : 1.Joey Dunlop - No Ordinary Joe DVD 2.TT Closer To The Edge DVD 3.A Decade in MotoGP 2002-12 DVD 4.TT 2011 Review DVD 5.MotoGP Review 2011 DVD 6.TT 2012 Closer to the Edge T Shirt Black 7.Closer to the Edge DVD & TT 2011 DVD 8.TT3D: Closer to the Edge (3D Combi) 9.Ulster Grand Prix 2011 DVD 10.Collector's Edition Closer to the Edge Funny how Fastest isn't there...
There are a fair number of cheap DVD players that are both region free and play multiple TV formats. Some of the "regular" DVD players at Wally-world just require an odd set of key presses to be set to do this. I've gotten hooked on a number of foreign TV series as well as the expanded motorsports selection available in other formats.