SS Feldpostbriefe

[BASKA1944]

Dear friends,
I have some 8 letters (Feldpostbriefe) of a SS NCO which I would like to sell. The FP Numbers are :
10 003A / 24505 / 10 003B / 04018 /13913 A / and 42216
All letters are from the same NCO, except one (42216) which was written by a SS Junker.
How can I offer these letters for sale ? Should I do this on this forum ? Are there specialised websites where I can offer the letters ?
If someone could assist me, I would highly appreciate.
Thks
Max