I’ve been collecting hot wheels for quite a few years, but have none of the ones I had when I was a kid. Ebay is your friend, though, and I’ve scored some mint condition cars from the early 70s, that I used to own. I just recently bought the pair of cars that came with the thunder shift 500 set, I still have the box and some of the track, but my original cars were long gone, so I jumped on ebay and found both the Monte Carlo and Torino! They are both in better condition than the ones I had, and I picked em both up for under $20 shipped. I recent years, I just buy as many current ones as I can, and don’t open the pack, they all go straight into large plastic totes, I’m not even sure how many I have, but it’s well into 5 figures.
Confession: Only about one third of the cars in my collection are leftovers from my childhood. I played hard, lost, traded with friends... I only have a few of the old original Matchbox car cardboard boxes.
Ebay can be great, and expensive. I bought a bunch off ebay in the 2009-2011 time frame. I wanted to get the cars I had as a kid.
I also remember we never had an allowance as kids, but every once in a while it would be "toy day" and we'd get to pick out a new toy. The Machbox cars were 4 for a dollar in the basement of this store in downtown Columbus, or upstairs in a big bin at the old Sears. I'd walk out with 4 cars or 6 cars at a time all smiles.