For anyone who might have an interest there are sambo shoes for sale at:
for $20. Click on "shoes etc." listed on the left.
They only list certain sizes available but in reality they have all sizes in stock. You can order by phone or on-line.
They are the basic very light, seude/leather, variety with no insert. They are all black with red ankle and big toe joint pads. Strictly for wear on the mats.