If you go to "International Stock" in Kings Heath they have a few ballet DVDs at £7.99. I was there today and picked up the Australian Ballet's Coppelia (Pavane & Horsman) and Spartacus (Pavane & Heathcote), Royal Ballet's La Fille mal gardee (Collier & Coleman) and Coppelia (Bejamin & Acosta), ABT New York Gala, Bolshoi Ballet '67 and The Glory Of The Bolshoi. The last two feature the likes of Bessmertnova, Mukhamedov & Ulanova.
I've seen these titles at going for twice as much at HMV and the like. Availability of copies are limited.