Patrick Goddard, who owns Rainbow Springs Hatchery in Durango, was able to source the tigers. He is out of them now but plans to get more next year.
I got them second hand from someone near Durango who bought them from Patrick. The man I bought them from has a property with springs giving 1,000,000 gallons of flow per day of cold water suitable for trout! He has 7 ponds on his place plus 3 raceways for his hobby of trout rearing. I'm envious, to say the least.