Well $99 bucks is very costly given even back then floppy drives for PC you could get for around $20-30. It was a huge apple premium for a basic floppy drive. The drives never got that high in cost as the technology to read and write floppy drives was pretty old tech even by then.
The $99 is an example of an Apple Tax.
You numbers for the cost an ink jet printer are pretty far off as well because lets see my parents bought a color ink jet in 1996-97 for about 70 bucks.
As I recall those USB floppy drives also did not support 400K and 800K discs.