Try Best-Buy, I know they carry the learning C7.
If you can't find one locally, you can resort to the web - J&R Music world (www.jandr.com) has them. You'll pay about $30 total (including shipping).
The non-learning C7 can do most of the stuff the learning one can - macros, advanced codes, re-assignment - except, of course, learning. You might want to keep it around as a spare, the wife's/girlfriend's remote; _OR_ take it apart, wire up the leads to one of the macro buttons to an X-10 Universal Module and power-on your entire system with X-10!