I believe it was around a 3500$ option. Pretty standard price for a sport package upgrade on a 3 series. Most later cars (like my '98) have sport package because BMW was doing a promo for the 328's with sport package.
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Hot: 2001 Estoril M Roadster
ZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt ZCP 19's michelin supersports, deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black