I also have a couple bikes that take this size and there are a number of posts available but have found that a 29.4 to 27.2mm shim really opens the doors to having a wider choice of seat posts to choose from and also a much lighter weight post.
Yeah, I think I'm going to just go the shim route. I actually had a Thomson seat post in this size & color and sold it because I thought I'd never use it.