Mine isn't gaming, but I have two similar stories.
I was sorta a weird kid (not much has changed) and I was crazy into K'nex. (The building toys.) When the school science fair came around, I had just gotten a motorized K'nex ferris wheel toy...and I wanted to have it on display. So I picked the project "How do Ferris Wheels work?" and got to work. Well, I lived just south of Cedar Point, so I figured I'd start research with them. I wrote them a letter saying that I was doing this project, and they wrote back that they had removed the Ferris Wheel from their park to make way for more roller coasters...but that the company that had made their Ferris Wheel was Big Eli and I got their address. So I wrote Big Eli. They sent me not only a bunch of beautiful glossy pictures of Ferris Wheels throughout history (which made the poster board a breeze!) but the real construction and maintenance manuals for their most popular models of Ferris Wheel. I was in 6th grade and although I couldn't even read those schematics, I thought it was sooooo cool. Still have all that stuff in a box in our storage room.
Story 2: One of the stranger hobbies that I've picked up over the years is balloon twisting (like the dogs and hats and things). I started about 5th grade or so, and I still do it from time to time today. When I was younger, I'd just go up to clowns at fairs and things and ask them to show me how they did something. (I still do if it's something amazing...there aren't that many balloon twisters and most are happy that you've noticed a particularly difficult twist. It's really a craft, as strange as it sounds.) Anyway, my mother just didn't know what to do with this new-found hobby. There weren't any stores or anything that sold balloons. So she went up to a clown one time and asked him what brand of balloons he used. He told her that the best were Qualatex, and he always went through them directly. So Mom called Qualatex to see if we could just buy single bags of balloons (they're sold by the gross and one bag lasts me a while.) They were so surprised that there was a 10-12 year old that interested in ballooning that they just sent me this amazing pack of stuff. All sorts of balloons, their catalog, a bunch of starter guides and things. I used what they gave me for free for several years. (Now, thanks to the internet, there are many websites that will sell Qualatex by the bag rather than the case. I've used other brands and they really are the best!)