I found Leather CPR at Home Goods. I think some of the stores like Home Goods or Bed Bath Beyond, have things sometimes and not others. But that is the only place I found it. I live in an area with farms and hourses too. Lots of leather cleaners and conditioners, but not Black Rocks or CPR!Check your phone book for Tack shops...equestrian stuff...or maybe a farm store to find Blackrocks...otherwise e-bay, etc.
And yes, straps and hangtag. Sounds like you're picking up your skills quickly. Everyone has their own process for rehabbing, so the more you read, you'll get the hang of it and figure out what works best for you. Continued good luck!