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voluncheer:Buy them all while you can!!!
i am exactly in your position, and was only able to buy what was available through les mills this week which is release 65 - 68 ( as i already have done 69 and 70) and you cant go back further than that.
just ring les mills number if you dont want to go online order, and if you want to look at old releases and all of the tracks you can go to a site called "totallylesmills.com.au and it will list every release and song which is really easy to locate and read. this is an independent site all about les mills and sometimes can be helpful with a little bit of extra information if you are like me new to all of this and want to know as much as i can ........