Ever heard of eBay?
There is also a site listed below in related links. When you list your cars for sale with them, the first 2 months are free and you are able to list as many cars as you wish.
It's much easier to work with then ebay. In fact, it's so easy, you'll be able to see how to list your cars before you receive the instructions that will be sent to you.
You'll have your own site within 'diecast-search' that is created as you list your cars. Also your cars will be included in the Search For Diecast area where customers are able to shop and compare prices on one page.
They get lots of traffic and a FREE Value Guide attracts even more customers.
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I was recently on BigFlySports.com and they have a wide range of NASCAR products and collectibles. Not sure what items you are looking for from the 1950's but I would recommend checking out that site, they might have what you want.
There are several places one of which I have provided for you.
Please see related link below!
The Nascar official website has it's own shop. There is also eBay special websites.