I've just found out that Sweetbrier Studio is no more. But don't fret, Penni-Jo, who created the designs has taken over and the molds are back in production. You can read the story here: http://claylady43.blogspot.com/
There's links there that will take you to the place to buy the molds directly from Penni-Jo..
If you're in a hurry to get your stuff and don't want to read all about it, here's the link to her online store: http://bestflexiblemolds.com/index.html There's more than molds there, it's well worth the visit.