I just don't get people that pay big ebay prices for stuff like C'man "V" that isn't rare. In NJ and eastern PA around here I can go out any weekend and pick up USA craftsmen for almost nothing at fleas and garage sales. I've read in other areas old tools aren't as common, in this area we're up to our neck in them.
One place to avoid is anything calling itself an "estate sale," the operators/hosts use ebay to set all their prices, IF there are a lot of tools. But if the estate sale ad shows a ton of like Hummel dolls and the operators are women, that one you should hit because the garage might have some scores. I got a Snap On 1/2 breaker bar 18 inch for 50 cents a couple years ago at a sale focused on like 8 million Barbie dolls and their accessories. They even threw in a tin dustpan and corn whisk broom. Nice ladies running that sale.
Well, eBay is probably the very worst place to look for collectable anything. If something's desirable to collectors, it will get bid up to about its maximum value. The search tools there are so good that people who are looking for something are definitely going to see it.
If you're just collecting some tool brand, but not specific items from that brand, you'll always do better, and get some fresh air and sunshine, by going to sales, flea markets, swap meets, etc. It's more hit or miss, and you can't really be hoping for some spectacular rare find all the time, but you can find stuff at prices that are low enough for you to make money selling that stuff on eBay.
That's where all the eBay stuff came from originally, anyhow. You can also go to estate sales, but most of the time you'll find higher prices than you'd hope to pay. However, some of the time, if you go on the last day of the sale and actually dig through boxes in the garage, you can find a real prize. Don't count on it, but don't discount it, either.
Now, if you're an advanced collector and are just looking for specific individual tools to complete a set, eBay is where to go, of course. But, you ain't going to get any bargains, unless you're the only collector of that brand or line of tools. That's unlikely, though.