Advertising is probably one of the largest collectable areas in the world. There are 22 sub headings under advertising on eBay and each of those can have an additional sub-heading. One of the most affordable forms of advertising is old magazine advertisements. If you can't afford $75,000 for a 60 Cadillac, you probably can afford $10-$20 for a full color version of the same vehicle from Life magazine. These beauties look awesome framed and matted on your man-cave wall. Now you can afford to have any car you want. What a great way to relive your youth. Why not one of every car you ever owned. Though you may want to put the 1984 K-Car somewhere slightly less obvious; like a closet. No one wants to admit they ever had one.
There are many people who do the same with key products. Watches, pens, farm equipment, household products we grew up with like Crest, Tide etc. Kitchen items are huge.
I will be posting several hundred of these full page and full 2 page ads of all your favourite cars from the 30's through the 70's shortly. If you're looking for anything in particular, let me know before they go to market.