I paid 4k for my m3 e46 with 90k miles was a convertible and smg tho but a hard top makes a whole difference haha car runs great since then. *except for sensors going out*
We're not exactly sure how many Japan Red cars were built for E46 M3s. But some quick Googling states that E46 3-series, in general, had less than 150 Japan Reds. We believe it's less than 15 for M3s.