The current value is $150 per IF you can find them. I just got vol 4 and got soaked that much... But it was "the only game in town".
-------------------- "When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand
Vol 1 Alexander Henry is very difficult to find, nobody had one, took me months but got one out of Germany eventually. Put your own value on them but be aware insurance assessors will try to knock you down in the event of a claim