Collins also sells "hen sets" consisting of the cape( neck) and saddle for $17 which are excellent-- I have some at home I'll check tonight on the size range of hackle feathers. The stems are easy to wrap and he has them in a variety of colors.
I checked last night and the Collins hen set I have will hackle size 18 (smallest feathers on the top of the neck) to about a size 4 (bottom of the neck and bottom of the saddle).
From left:
Conranch grizzly hen set (hackle sizes 14-2) $45
Conranch JV Hen set (JV= Juvenile bird, physically smaller, and smaller feathers with shorter barbs feathers ) hackle size 20 and larger about $32
Collins dark dun hen set consisting of a cape (cape = neck) (darker dun color) and saddle (lighter dun colored) about $17
Other hens more widely available in stores are
Whiting Hen Cape (with red Whiting Label) typically hackles size 18-12 hooks, and goes for about $24, and
Whiting Hebert Miner hen capes (with green Whiting label) typically hackles size 16-10) for about $20