I have two outboards from 1975. The first one I got was a gift, with boat, from my Grandfather when I was 12, a 7.5hp Mercury. The second is a 25hp Evinrude. I use the Evinrude, because it gets me places fast. The Merc has been out of use since the pin that holds the cowl down wore out and I was in constant worry of having it blow off while under way.
I've been going to a local boat shop when things go wrong with 25hp. The last repair was for a part that controlled the throttle. It seemed reasonable, and I can't remember the price. At that time, I took the pin from the 7.5hp and asked them what it would cost to replace it. They said, "it was rare," and they happened to have a used one they could sell to me for $45. Since I was thinking that the whole motor was worth about $200, that seemed really high.
Today I went searching on the internet for the part. $16.50, new, plus $7.95 shipping from MarineEngine.com. I'm telling you, the guys at my local shop just lost a lot of my DIY business. If they would have sold me the used part for $16.50 I would have been happy and never looked for other prices. I gotta wonder about the business decision making at the local shop. I know if I'm completely out of luck, I'll pay a lot more for a part if I need it right now, but soon, I'll have two engines and be able to wait for parts to come in. It seems unethical, to some extent.
I'm posting this, so if anyone else needs parts, they've got a reference to check.