Per my Khasi research this Dashain, this is what I have found. 

Marsh and Sons

Half Moon
Bay, CA 94019

12950 San Mateo Rd

(650) 726-5792

Dario's Ranch

12865 Mt Hamilton Rd

Mt Hamilton,
CA 95140

(408) 926-9525

Silva's Ranch

12130 A New Avenue,

San Martin 95046

This website give other places in the Bay Area where goats are found:

http://californiafactoryfarms.com/wst_page4.html

Please note that only "Type S" means Slaughter House where, goats are slaughteres, cleaned and cut into pieces. They also provide with Rakti, Andra Bhudi, Chhala, Khutti, Tauko, Puchhar and Kaan.

How about  a Link to "Where to buy Khasi in Bay Area" on Sajha dot com?