"Yaron" wrote
I'm interested in British Mandate banknotes issued for Palestine...

Go to www.money.org (The American Numismatic Association) and click on
the link for Marketplace Deaelers. Click on "Select by Specialties."
Scroll down to Paper Money (Foreign) and click. Not all of the
best-known dealers are there. (Lynn Knight is missing from that list
for some reason.) It is, nevertheless, a start.

If you live close to Long Beach, Chicago, New York, Baltimore,
Detroit, or Orlando, you have annual or semi-annual numismatic
conventions that draw hundreds of dealers.

If you use www.money.org to search dealers by state, you can find a
shop near you.

Michael
ANA R-162953