Here is the address of a German friend who is still selling the
following puzzles (among others):
5x5x5, skewb, magic dodecahedron, German calender cube, pyraminx...
An der Wabeck 37
Tel.: ++49-2302-71147 Fax : ++49-2302-77001
Books he is selling (among others):
Bandelow: Inside Rubik's Cube and beyond (~$15)
Singmaster: Notes (~$10)