They used to be like $75 - $100 each just about 2 years ago. Thanks to some importers like Speedie (Nick), prices have gone down by a lot. Now they are about 1/2 that which is still high, but not completely nonaffordable.
The harder it is to keep something alive will drive prices up. That goes for anything. For example, if you keep 20 cherry shrimps, by the end of the year you can have about 1000 shrimps. However, if you have 20 Taiwan Bees, you'll probably have at most 100 by the end of the year.
My bf and I have spent so much money on shrimps for the past few years and the higher up we go on shrimps, the more money we have to spend on getting there. If I were to sell any of my Crystals, I would want at least $10 each given all the time, money, effort I had put into them so I can see why Taiwan Bee breeders could demand higher. Importers that resell are different since they don't spend 2+ years to develop their own strain, etc.