These are seen occasionally in the African trade:

white:
eBay item number:
351890384015

black:
eBay item number:
142289304571

brown:
eBay item number:
222418818583

The ones Floor shows are vintage uncirculated, and the seller described them as...white scalloped textured ovals, at prices very unlike the ebay ones, #s above. Lucky for me! The seller had only white. I have a few black. Would be fun to find colors, I'll bet they are "out there somewhere".....Glad you are enjoying them, Floor!