Allan....most Home Depot's have these bits. Check the Greenlee tools section. They look like any other long installers bit but the shaft is flexible. They also offer a optional handle for the shaft of the bit to keep it bent as you drill.
Check here....
http://www.smarthomepro.com/9067.html edited for link and clarity.
[This message has been edited by Sandro (edited 07-13-2005).]
[This message has been edited by Sandro (edited 07-13-2005).]
