Back when the NES was the latest and greatest video game system, I really didn't like the cheap black plastic sleeves that the games came with. I much preferred the clear plastic cases that totally sealed both the game and the instruction manual up that the games used to come in when you rented them from the video rental stores. When I discovered that places like Toys'R'Us actually sold them for around five bucks for a case of five, I snapped them up quickly.
This was all well and good back in the day. The problem is that since this time my collections of old video games have increased, and of course there isn't a store on the face of the planet that wants to waste shelf space for empty cases for video games for video game systems that haven't had new games produced for the system in well over a decade. Thus, right now I have games for my NES, Super NES, and Nintendo 64 that are laying "loose," and while this is hardly a life-or-death issue, it's a huge annoyance when I try to get things organized and keep all of my games for a given system in the same general area. I haven't looked on eBay for the cases yet, but I may just have to do that. Heck, I may even buy old video games I already have copies of if I can just get some more of those cases.
I will note here that other video game companies have a history of putting their games in decent cases, but the cases haven't always been ideal. Sega gets a kick in the crotch for their huge Sega CD/Saturn cases that are about a sixteenth of an inch taller than will fit properly in a DVD rack. Sony likewise gets a kick in the crotch for changing the packaging of Playstation games in the middle of the system's lifetime, forcing me to "make" jewel cases for my older PS1 games and have to keep the oversized manuals in a separate place. Microsoft gets a kick in the crotch because ... well, they're Microsoft, and that's all the excuse I need. Atari gets a kick in the crotch because the main reason no one ever made plastic cases for Jaguar games (aside from the fact that no one in their right mind ever wanted a Jaguar) was because the cartridges were curved, and thus hardly ever set right no matter where you put them. The only company that escapes my size 11s is NEC, whose TurboGrafx games all came in standard CD-sized jewel cases, although how many of you actually remember, much less own, a TurboGrafx?