I found a snapped leggie at mettams the other week. Took it home, undid the connections with my fin key, hacksawed the end off the board-end connection so it would fit onto another leggie I had that had the board-end connection broken. Just had to take a few mm off to get the screw holes to line up.
Frankenstiened two different leggies together to make another spare

Which is handy because I have a habit of going through them pretty quickly and they aren't exactly cheap.