I've seen Mini Marks on ebay a number of times so I would check there. A seller called getzen08 usually has one for sale every week. In fact I just checked and he has one right now for bid. If bidding isn't your style, I would email Peter Lin of Big Leaf Orchids. I think he had one for sale on his ebay page a few weeks ago but he might have another if you send him an email. Keep an eye on
his website too, which sometimes is a different selection than his ebay. Good luck!