Check this out ......... I found this looking for something else !! According to the diary of of a US soldier - In 1966 U.S. Historic Arms & Militaria dealer Norm Flayderman discovered a huge cache of pickelhauben in a remote corner of France ........... he bought all 500 - brought them back to the U.S. and sold them for $34.50 each !!!!! Here's a photo of Norm with them all !
Bloody rip-off merchant!!!! (Actually, that was quite expensive for 1966 (for a bog-standard helm) - they were only going for a tenner or so more 15 years later)