Where can I get an euro?

I'm curious, where exactly can one acquire an euro? I understand it's the official currency of the Eurozone, but I'm not quite sure where to go to get my hands on some. Is it something I can pick up at a local bank or currency exchange? Or is there a specific process I need to follow to obtain euros? I'm looking to make a purchase that requires euros, so I'm eager to find out the most convenient way to acquire them. Any insight you can provide would be greatly appreciated.