The only one I've seen so far is from Brenda Imus/Gaits of Gold, and for a number of reasons I absolutely will never purchase a product from her again. I had a bad experience with a poorly-made product from her line, and an even worse experience with her attitude when confronted with the fact that many people had similar issues with the same product.
Back to the original question, though. . .suggestions for round-skirt saddle pads with a contour wither and tacky underside? I found my own square pads for around $40 and would like to find something in a similar price range.