Average gasket kit costs about $40. Then 6 Quarts of fuid at $10-15 per litre. Around $100-125 if you do it yourself. As ZeGerman said, shop labour rate will apply. That is also if you can find a shop willing to do it. I found that not many places want to change the transmission fluid on E36's. A couple places i found that would do it, wouldnt even drop the pan. Just suck the fluid out and refill. This is why i do it myself.
Haven't been on this forum in months, but saw this "old" post today. Just had my '96 328i's transmission fluid changed by my indie mechanic about 6 months ago. Dropped the pan, ordered the filter and gasket kit, and got tranny fluid from BMW. Charged me $300 and change for the whole thing if I recall. Said the fluid was dirty, gummy, but metal free at 130k miles. Hope this helps.
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