The Whole Foods in San Mateo charges $7.99 a pound for their salad bar, same as the WF in Los Altos and Cupertino. However, unlike those WFs, this one does not have organic produce in the salad bar. Thus, I think the $7.99 price per pound is unjustified. I think the Whole Foods in Palo Alto also has an organic salad bar for $7.99 a pound.
There are some vegan options in the hot foods bar such as channa masala (a chickpea Indian dish) and the deli. Tasty but a little too spicy. The vegan options are not labelled as vegan, so you have to take the trouble to read all the ingredients. The only vegan salad dressing was the balsamic vinegrette, which contained sugar. The channa masala contained sugar as well.
There are also vegetable burritos that appear vegan, but the line was so long I didn't check. Unlike the WF in Palo Alto, there is no vegan chocolate pudding in the prepared foods section.
Cons: Salad Bar is non-organic, Difficult to avoid sugar.