Should be an easy fish for vendors to get....when I was in business, they were always on my lists.
Trouble is, they ship terrible.
I had a small group of 6" specimens in a planted tank.....very cool site.
G/L in your search...definitely worth it.
I just got some redtail Hemiodus in at the shop today. I may be able to get some more on Friday. Let me know by tomorrow morning how many you want and I can get them in on your order if I do not ship out tomorrow.