Buma (Jr.?) aka Mark Burger's wares can be seen here: http://markburger.com/
(enter "cups" in the search)
I believe Stevens still carries several designs of Mark Burgers cups. I have a set of Marks Old World pewter cups but have not used them to perform. They are beautiful. The same height as the Johnson cups, which is a smidge taller than true PF cups, but with a slightly more PF style profile than the Johnson cups. Two rings, but smaller than PF cups and with a slight space between them.
I'm not a fan of the Porper Cups, not because of quality which is as always excellent, but because of the design. Be that as it may, links to the Porper offerings are here http://www.porperoriginals.com/cups_main.htm
Rings & Things (sp?) II are here http://www.rnt2.com
, and according to *this* http://www.rnt2.com/product.aspx?productno=72
, they may eventually/soon be re-releaseing Jim Sistis cups. Finally, RNT 2 seems to be releasing a set of PF replica (?) cups here http://www.rnt2.com/product.aspx?productno=70
Sherwood Cups are here http://www.sherwoodmagic.com/