Free MP3 Music player that slows down music
ClogAmp
Here is a list of people/companies that sell clogging products:
Shoes and Stuff
Carl's Clogging Supplies - turn your speaker volume down
Steven's Clogging Supplies - turn your speaker volume down
Videos Available for purchase
Ira Bernstein - Ten Toe Percussion
Jeff Driggs Dance Packs
How to Clog - Russ and Lelia Hunsaker