Here's a golden oldie. This is The Amazing Spider-Man King-Size special number 6 from November 1969. It reprints material that first appeared in the first Spider-Man annual and in Amazing Spider-Man #8 both from 1964.
This is of course written by Stan Lee and drawn by Steve Ditko, and the best thing about it is that each confrontation gets a single full page splash image which are worth the price of admission alone, or would have been in 1969 when this book was 25 cents.
As you can see from the scan this is a fairly beat up copy, the cover is just about hanging on but it's all dog eared and creased. The pages are all intact which is nice for a disposable comic book that is now 42 years old. And here's the thing, I have no idea where it came from. It's in my collection and I discovered it when bagging and boarding every thing properly a few years ago. But I have no recollection of when I bought it or where. Maybe I found it in some old back issues box at a shop or a show? It certainly came into my collection long before eBay.
Isn't it nice to come across a little gem like this? It's probably worth pennies but it's just nice to have.