Clear availability is merely a question of supply and demand, as well as partially ZF electronics being a bunch of old-school stooges. The same thing happened with browns not long ago, and older members might remember when reds were rarer than gold. It's simply more mismanagement on a keyboard company, which is surprisingly common.
Topre scarcity is another problem entirely. The Topre corporation caters to a very specific and niche market, and it's only due to their unbelievable popularity that they are available outside Japan at all.
What needs to happen is for unicomp to wizen up, stop mucking around, and devote actual resources to marketing, promotion, and (possibly) some real R&D. Sadly, they are like cherry / ZF: unwilling to change.