How about this:
http://www.dragonglassmolds.com/SQUARE% ... LDS/13.htm
Unfortunately, it appears to be out of stock for online ordering, but maybe you can find a distributor.
Edit 1 to add information from Dragon Glass South Africa website:
So, the above information is for Dragon Glass USA. The molds are designed in South Africa and the packages I have received from Dragon Glass USA appear to have come from China.
The Dragon Glass South Africa site has a list of distributors
http://www.dragonglass.cc/hosting/drago ... liers.html
including ABR Imagery (Bloomington, Indiana), Art Glass House (Coca Beach, Florida), Cline Glass (Portland, Oregon), D&L Glass (Boulder, Colorado), Ed Hoy's International (Warrenville, Illinois), J. Ring Stained Glass Studio (St. Paul, Minnesota), and Thompson Enamels (Bellevue, Kentucky)
Edit 2 to add information from another place on the Dragon Glass USA website:
The US site also has a list of distributors which adds Northwest Art Glass (Redmond, Washington), and clarifies that ABR Imagery and Thompson Enamels are distributors for videos and not molds.
http://www.dragonglassmolds.com/DISTRIBUTORS.htm
It also lists C & R Loo, which apparently has closed this year. It is probably just a coincidence that the name Oliver Loo is associated with both C & R Loo (Richmond, California) and Dragon Glass (Shingle Springs, California - I think, or somewhere nearby). The C & R Loo site is gone, though, and the Dragon Glass site is still active.
Northwest Art Glass - doesn't seem to carry this
Ed Hoy's - doesn't seem to carry this
Art Glass House - can't find current website, I think a new site was under construction earlier this year, but calling owner directly is possible
http://rociobearer.com/about.html
Cline Glass - can't find website
D & L Glass - doesn't seem to carry this. Lists Dragon Glass as a supplier, but only has 4 mold styles
J. Ring - search for Dragon Glass has no results, also closed as of 1 December 2016