The closest version was the folding clamshell GBA SP, and if you happen to have one of those still lying around, Boxy Pixel’s new Game Boy Advance SP Unhinged housing is about the closest you’ll ever get to a Game Boy Advance Game Boy—or a GBAGB, for short.
The housings are milled from solid blocks of aluminum using a CNC cutting machine in a similar process to how Apple currently makes its laptops and mobile devices, and while you can get anodized colored options of the Unhinged case in red, blue, pink, and black, it kind of feels like a crime to go with anything other than the natural aluminum silver.
At $94, plus $20+ for a matching set of machined metal buttons, it’s not a cheap mod considering it’s also BYOGBASP, but you’ll also never have to worry about an aging hinge snapping ever again.