Art Gould has done at least 4 water pumps for me. Every time I got them back within a week. I think the price I paid for small block pump was around $65 plus shipping, but that was 5-7 years ago. They did great work. Prices may have gone up a bit since then.

http://arthurgouldrebuilders.com/gen...p-restoration/

Sent my pump out and got it rebuilt and back to me in about 10 days. Cost 69.50. Happy with the service and price. Shipping back and forth cost about 34.00. I used these guys as suggested here.

Commercial Water Pump Rebuilders
9431 Clay Road
Houston, TX 77080
Phone: 713-864-5199