Welcome.
Auction houses would be your best bet.
I would also subscribe to VCP (Vintage Card Prices) and put a tracker on the cards specifically you are looking for. They will send you an email if one pops up somewhere.
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Looking for
1930 baguer chocolates Al Lopez
1880-1930s Detroit Tigers
1907 Wolverine News Postcards
1907 Dietsche Detroit Tigers Postcards
1907-1909 H.M. Taylor Detroit Tigers Postcards
1908 Brush Detroit Postcards
1908 Detroit Free Press Postcards
1909 Topping & Co Postcards
1935 M120 Detroit Free Press. 17/18 complete. Need Tommy Bridges.
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