Solid State Buffer

For impedance reasons I am looking for a buffer. Like a tube buffer, but solid state instead. I know about the Burson Buffer, but I don't think they make them anymore. Any other suggestions?
Just to throw my 2 cents in if you find one. The Burson buffer is what Chris Johnson of Parts Connexion called the Cadillac of buffers. It is awesome. I have some very nice systems and components and on my well balanced system there is no negatives with the Burson buffer and big positives. You could put a want add in the classified section and possibly get one that way.
The FirstWatt Pass B-1 is an excellent discrete buffer using high speed JFETs. Hard to beat. If you are handy with a soldering iron you can build one - Pass sells the boards and stuffing guide at