For what it's worth, micholitzii is easier to find than in the past. I would suggest trying Troy Meyers, Peter Lin of Big Leaf Orchids], Rob Shepard of Sapphire Dragon Orchids, Norman Fang of Norm Fang Orchids, aka
Hobby Growing, and John Nelson of Louisiana Orchid Connection. There's always eBay, too. Species are generally the domain of the specialty growers. To meet these people, consider joining FB pages for precisely that. Most will be happy to steer you in the right direction.