There is some question about the quality of the parts used in the Bosch rebuilt alternators. IE: Chinese bearings. If I buy the parts myself, I can control what goes into it.

Even with the lower quality parts, the rebuilt units are expensive. The best price I've been able to find is about $400.

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2002 X5 4.6is - Imola Red/Black (Sold)
2001 740i M Sport - Anthrazit Metallic/Black (Sold)
1998 M3/4/5 - Technoviolet/Dove (Sold)
2003 Z4 3.0i Sport - Sterlinggrau Metallic/Black (Sold)
2009 Mini JCW (The Wife's)
2015 i3 REx - Arravani Gray/Tera World (Daily Driver)