Most BOMs I've seen are under contract, which means the patterns are locked up in the kits for a year or sometimes more. If you cannot find the pattern for sale by itself, then you probably won't be able to find it until the contract expires. Which is a bummer, because I like the pattern but the fabrics are not my style.
However, the quilt designer, Lynn Wilder, has several other patterns for sale, and a couple of them look very similar in design to "Ribbon".
http://sewnwildoaks.blogspot.com/p/blog-page.html