I came across an English Language copy in the Early Music shop in Bradford a few years ago and nearly bought it. I wish now I had as I haven't seen it there since.

The 1967 Dover edition is still reasonably easy to pick up second-hand on t'Internet by the looks of things, ISBN 0486217451 (13-digit version 978-0486217451). Just putting the ISBN into Google shows a whole bunch of purchasing options.