Do they look like this? http://www.etsy.com/listing/90374194...earch_type=all
These are flatback buttons. There are several people on here that make these. They are all over Etsy. And, I can't remember the person that has a sponsored link on this site but hers are very nice. Just do a search for flatback buttons or if your looking for a special character on them google might help.
ETA: After I hit send the sponsors like popped up. http://www.flatbackbuttons.com/