Jan is "still" very much around
. He has republished a couple of his volumes and his latest "Central Powers Pistols" is still available at a quite reasonable price (around $89 as I recall) the last time I heard. It is a wonderful compendium of several types of pistols of the WWI era. If you do not have a copy I highly recommend you seek one out. His books are indeed in high demand and the earlier works that are currently out of print can be costly. I suspect that anyone other than Jan that creates a reprint will be faced with far more expense (i.e. lawsuit) than royalties
.