Oh, I see. I've a card for a place like that, too. There's only "one" library, but it is somehow connected to others and I can have books from those sent to me. But I cannot go INTO any of those "other" libraries and check out books. I also have a card for Columbus. It is a huge system and it has a huge number of branches. I can use my card at ANY branch, or return books to ANY branch.
I posted to all the homeschool groups I belong to that I wanted to buy or borrow educational CDs to use in the car with my kids and managed to get tons. It does depend on what you can find for cheap that is for sure.