Tony Miller is the go to guy for Strops, he's at "thewellshavedgentleman dot com or Don and Lynn at
straightrazordesigns. These are the two I'd recommend for a quality strop. I have both Vintage and new strops myself.
While the vintage one's are nice to have, I prefer the newer ones and the new "Latigo's" are an excellent choice and you will not be disappointed.