The above said the only ones I found that were in decent enough shape Id consider buying personally were in the $7000 range. Way to much for the average E53 in these parts. But its the manual trans I guess that's running the price up.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install