Real perry is an english drink made from specific pear cultivars (with great names like yellow huffcap). The perry pears are quite different to eating pears (high in tannin), and take many years to bear fruit. You won't find much real perry outside of England.
I've been grafting and planting some perry trees, but I don't expect to get fruit anytime soon, maybe 15 years. "Plant perry pears for your heirs".