I agree with Ken, most of the strips you find on the pegboards in the flyshop are pretty miserable. I finally found a good source, The Fly Fishing Shop, one of the sponsors of this board, so I guess I can post a link (?).
I've been using their "stripped whole hides" both cross-cut and straight, and they are superb IMHO.
All the usual disclaimers- I've no connection, just a happy customer, etc. etc.