These are very common transceivers and are readily available on the used market. This particular unit has an interesting history. I picked it up at the Charlotte hamfest. It was being sold by Wycliff Bible Translators. I had been a contributor for several years to two missionaries in that ministry. Before more modern communications methods became available, ham radio was the only way to contact the missions at remote locations. Obviously, this was one of those radios. The front panel was profusely marked with tuning and loading marks. Who know, this radio may have been used or used to help the missionaries I'd helped support. It had to be rescued and restored.
Rigs with a special history make you wonder who used it and who was on the other end of the QSO. This rig may have been the link back to civilization for some far away missionary.
I was lucky and was able to purchase a brand new front panel from Drake just before they quite selling replacement parts. Several other NOS parts were purchased at the same time. After some careful cleaning and aligning, this little TR-4C was returned to very nice condition.