I was told by my mom and dad that the church we attend uses Polish pear wine for communion.
Unlikely to the extreme if it is a Catholic church. Only grape wine can be used, and wine made from other fruits is specifically forbidden. If it's not a Catholic or Orthodox parish, though, it might be pear wine.
If it is, about the only way you would be able to purchase it is to contact the pastor and ask for contact information to his supplier. Otherwise, it would be nigh impossible, unless you make it yourself.