Juztice, I don't believe that they are of great wealth at this point. You may try further research referring to them as nesting dolls, Babushka dolls in addition to Matryoshka dolls.
I have searched as much as I can (an avid fan of the Magics from the beginning myself - especially when Pat Williams was with them (He and previous wife Jill adopted children at the same time my family did and was acquainted with her).
I don't believe these are in high demand. A souvenir. By the time they are vintage (50 years old) they may be worth more.