The instant gratification is exactly what I don't want - I don't want to go to a store, buy on eBay or use an emulator.
Emulators aren't a good deal because they have no value, anyone can go use them.
I want the high of finding something tangible at a good price and in 2018 that's harder than ever.
Quite simply, you need a new hobby. Games being in every yard sale for cheap was a direct result of games having little perceived value. Call it nostalgia, call it the Pawn Stars Effect, call it people just remembering old games are fun- but these things are no longer value-less, and people will seek to get 'what it's worth'.
If you largely seek just 'the thrill of the hunt', then there's other things that can be had for under-value secondhand to hunt for. Sliver's a good one- lots of people donate old sliver not realizing it's scrap value, so if you can find it you can make some money. If you still want games, you need to be largely focused on the 'dark era'- the stuff that's too old for game store but not retro yet. Wii games are squarely in this window right now. PS2 and OG Xbox are kind of there as well (backwards compatibility & higher age is pushing these up to retro now.)
For me personally, it's very much more about the game than the find. Don't get me wrong, a good find is still fantastic- but my collection is big enough now that the games I seek aren't going to be easy to find, even in my retro gamer paradise of the Pacific Northwest. I'd rather spend more on something I really want then less on something I kind of want.
What I probably enjoy most- and it's rare- is the surprise favorite. You know, you buy a game for a buck or two, and it ends up just clicking with you? To the point that if you'd known when it was new, you'dve paid full price? Now THAT is awesome. Last one of those for my was Enslaved: Journey to the West. Bought it at a Gamestop for 3 bucks, becuase it was 3 bucks, and just fell in love with it. I actually bought it again 2 days later becuase I found a version with a mini-comic pack in. Probably the best game for personal value since I got my Saturn.