Online stores have a mess of 'em. When searching, note that the first Tab 7" will still fit, but you will have to do some work with an xacto knife to cut open a few holes for headphone and other ports, as the layout changed. This is what we did for the tablet for the kids; we purchased the Samsung branded (at the time on sale for $7) and cut out a couple holes. The remote control IR blaster wasn't needed for our tablets, for example, so we didn't cut out access for it.
If you want a case designed for the Tab 2 layout, search for Tab 7" Plus, as the port layout is supposed to be the same.