Blue Eared Pheasant is without a doubt the best available product for tying Spey fly hackles. It is nearly identical to heron and ties beautiful flies. Each pack contains 12 feathers so it isn't cheap, but well worth it if you put the time and effort into really nice Spey flies.
Of the 12 feathers in a package, expect to see some variance in sizes. Usually, there are mostly large feathers but with 1-2 medium and 1-2 smaller feathers.
Very limited availability. Buy them when we have them in stock!