RC garage is rebuilding them from what I've read on here. I would venture to say there probably your best option to ensure your getting a quality rebuild.
Yes. I got a quote from them for a rebuild today. I forgot to ask about a warranty on the nos. pumps. Anyone know if there a warranty on the nos pumps.
Should be noted that while the pump is on Highway Stars website, you can't add it to your cart. I know usually with them when this is the case, the part is not available.
*Edit - Buick Parts on ebay has a NOS pump listed for $459.