I think the lowest limit for HU cash is 10$ at Everest Poker. Full Tilt starts at 100$ buy in.
The players at Everest are so bad, so I think the rake should not be a problem for you.
Here is a HU cash video from this board:
http://forumserver.twoplustwo.com/showfl...4&fpart=all
There was another one, but I cant find it at the moment, but the search funktion could help.