Dragon Hopper is every bit as good as I always imagined it would be, and Zero Racers is great to have too!
These specific Virtual Boy carts aren't being made any more, unfortunately. You can still find them for insane prices on eBay though.
At the time, I think these were the only ones that did something like this. Now, if you Google around I believe you can find a couple other projects out there for other systems that have some sort of display built into the cartridge so it can display a game label. Not sure how many are finished products you can buy, or how many are open source projects that you would need to DIY.