If you don't tie lots of streamers then a half skin is the best option. Weasel half skin ready cut in strips of aprox 2.5-3mm wide provides all colors and shades from an entire skin because is the right side or the left side of a full skin. In this way tiers save money for other materials without stocking too much tying stuff without purpose.
Troutline Weasel Squirrel Half Skin Zonkered -natural is a fantastic option for tiers who love to make streamers from time to time.
In the video bellow you see a full skin and how strips are. The video is informative.