A new ABS controller will run you about $400 for the part, installation is extra.
I was able to pick one up on e-Bay for about $75. Should only be about 1.5 hours labour for a mechanic to install (it is under the van, so is a PITA to change yourself). There is also a place on e-Bay that will rebuild certain types of controllers for about $150. I had good luck with them when they rebuilt a cruise control computer for by VW.
Good luck.