Welcome to the forums. I would suggest monitoring auction sites, such as Reverb.com, Ebay.com, etc. I found an article on the TG33 and it had this to say about memory: " The card slot can take MCD32 and MCD64 memory cards for additional Voice and Multi storage. The TG33 can also read SY22 Voice cards and, as there are already several on the market, there's a ready-made library of extra sounds. As the SY22 doesn't have effect balance or effect level controls, these are set to their default values. ". Good luck ! Don