@thomasfuchs@hachyderm.io yeah, I took your advice mostly, though I bought from AliExpress, not EBay. The 128mb CF cards cost about $4-5 a piece and I mixed up vendors. One vendor advertised no-name CF cards but delivered Western Digital cards.
The $10 camera I put them in is an HP Photosmart 120 (1 MP greatest resolution) from 2002 and it looks to produce photos with a greenish tint in direct sunlight and flash. Some pictures don’t have that tint, so I don’t know what to expect.