TowX, i don't think you mean transfer case fluids, it's front and rear differentials fluids? F/R differentials fluid sold by dealer and in order to buy differentials fluid, you should bring a gallon bottom to dealer and they pump from their bulk barrel.
Which fluid you need? if you need differentials fluid, you should do what i just mentioned above.
If you need transfer case fluid for your xdrive, they will need axpensive fluid ($49.00 per quart) from dealer and i am sure they will have it there.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)