Where can i buy a real sherman tank and other world war 2 antiques?

try MVPA Military Vehicle Preservation Association.
M4 Shermans are very Pricey, hell even Ford & Willy’s GPW/MB Jeeps are in the 12-20K range
I would expect a M4 radial Engined Sherman to fetch 200K easily
Fallschirmjäger Amush Sherman Tanks in Normandy

Victory Vintage Signs [...]