You can buy the tapes from the Geddes Language Library @ Boston Univ

http://glc.bu.edu/authorinput3.a4d?TICC=RU++1.004

If I recall correctly, they were asking about $ 65 for the set...
if you were in Boston, you could use them in the library.

Also **** please note, the Lipson books are still being sold by Slavica Publishing ----- so if you are in a position to purchase them...

...and thereby help to keep them in print, support the Russian language scholar community, etc --- the link is

http://www.slavica.com/textbooks.html

and about 1/2 way down the page (or just search on "Lipson")