If you do a google search for "BMW E46 head unit" that should throw you up lots of options. Buy cheap and expect to get what you pay for but there are plenty of options.
If you go for one of those then you will need to snip the 2 plastic ears off but everything else should be reasonably plug and play with the exception of needing to connect the 2 SWC wires if you want those working.
I had an Xtrons Android unit that lasted me 5 years or so until it started behaving a lttle oddly but sounded great and have recently replaced it with a cheaper, approx £200, Chinese unit which with a little tweaking sounds quite presentable.
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Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT 
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