Boxy Pixel All-in-One
In January 2021, one of the coolest Game Boy Advance SP shells became available. It turns the Game Boy Advance SP back into a good old-fashioned brick. The shell is made of aluminum and is one of the best-looking, highest-quality options on the market.
The biggest catch is that you also need to buy an IPS screen and additional buttons, which the same company sells separately. Read the product description carefully!
You can buy the shell from Boxy Pixel.