In the previous century it was common to print pictures of cars on promotional items. Examples? Cigar bands, matchboxes, postcards and sugarcube wrappings.
The print runs and their reach were enormous, but it is impossible to determine whether it has also increased sales enormously.
During my searches I ended up at alfje.nl, a site where you can buy these items (for pennies)
A few examples:
Cigar bands
Matchboxes
Postcards