@Tofu_mommy, I bought a purple GBC shell many years ago for it. Doesn't screw on properly and sometimes you need either the OEM or new screws whichever fits.
I picked up a beat up AGS-101 for cheap and put it in a clear shell from ExtremeRate,the only things I want to do with it now is get an upgraded battery and a glass screen lens, the shell is amazing, and I even prefer how their rubber pads feel for this one in particular over stock ones, unlike extremerate DS lite shells…