I have come across the Leadbetter Interactive Series on ebay. It is on for a Buy it now at £14.99, which seems a bargain compared to the £50 from other sources.

I am considering getting it but don't have a camcorder to get the full benefits.

Incidentally I got John Jacobs Dr Golf 4 DVD series, new for about £11.50 on Amazon. These may be going back a bit, I think they were filmed in the early to mid 1980s but Jacobs is a great instructor and has given me some good things to work on in the game, especailly the swing path.