I think Whole Foods carries Harris' products (at least in L.A. area. I think you can also find them througout the Bay Area).
I think time or year is key for visiting Harris. Prevailing winds are important. In that spring and summer, I believe the winds blow the stench south onto the property. I had stayed at the hotel one night in May and the smell was all over the place.
However, I have been there in the fall many times, and I didn't notice the smell.
Harris is a good place to stop for a meal if you are driving the 5. However, if you have a little more time to spend, I would recommend going to "Woolgrowers" in Los Banos. It is a Basque, family style, restaurant. Well worth it.