It sounds like a good time to stock up on 7X17 holders. We are currently about to finish production of two batches of 7X17 holders to the standard Barry has mentioned, one of American cherry wood, and the other of very long aged Chinese song. And we have on hand some twenty or so 7X17 holders in American black walnut that are identical to the new standard except for the position of the rib lock.
Fit of the rib lock is absolutely essential so it is always good to seek advice before you buy from someone who understands the issues of ULF photography as they related to mating of camera and holder.
Adding whatever number of holders this size Barry is making I doubt there have been this many new 7X17 holders on the market in a long time.