A second-hand store! That's a great idea. I hadn't really considered that. I'd picked up my buttons in these big lots on eBay. And, I tell you, when my packages came in the mail, some of those buttons looked like they'd been scavenged from the floor of the NYC subway system or something. I mean, it made me want to pull on some latex gloves and transfer them to boiling water before I did any crafts with them.
At a second hand store, I could get a better look at the buttons and have more control over which grouping I wanted. Great idea, ConnieM, and thanks again for those photo links to the button trees!