Well, as I said before, I've never seen one leak. If I recall correctly, you have a 1995...with traction control or without traction control? I just went to www.car-part.com, and found several for a 1994/1995 850 without traction control for $150.00 in New Jersey. Since these pumps RARELY, if ever, leak, I see no problem with putting on a used one. Truly, what's the likelihood or replacing a bad one with a bad one if it happens so rarely? Pride of workmanship issue? Perhaps, but I own a shop; I take great pride in my work; I would quickly tell a customer that were it me, I'd stick a used one on. Liability...baloney...you'd know pretty freaking quickly if the used part was faulty and you wouldn't let the car go. My brother lives in North Carolina; I send him parts as he needs them, and the shop we located charges a nominal "use the provided part" fee. Of course if the part was to turn out defective, he would get paid to do the labor twice. This is only fair. Shops do make money on parts, and do have to pay their techs, provide benefits, and keep the doors open...but an honest shop doesn't want to leave you with a college budget of raman noodles and peanut butter.

As was said before, clean the ABS pump area with brake kleen. Use compressed air to blow it dry, or hell...use a blow dryer. Put someone in the car to push the pedal, look for the leak. If it's the fitting, carefully tighten it. If it's not, buy a used pump, and find a technician to do it for you. I don't think I'd advise you to make replacing the ABS pump your first repair attempt, but if you're game...

Chris