Not all of them:

Engin Cycles | Handmade Titanium Bicycles Philadelphia, PA

He's now building only ti frames and is quite busy:

"WAIT TIME
NOTICE: Currently not taking orders. A primary goal has always been to deliver a product in a timely fashion. The wait exceeded what we considered a realistic wait, so until the queue is more managable it is currently closed."

Got mine in May of 2015.