I'm so glad that there is at least one Asian grocery store in the valley. Unfortunately they seem to have a hard time keeping some of my favorite items in stock, I wonder if this is a result of some of the import restrictions/delays that have been a result of the recent quality issues with food and toys imported from China.
I'm half Chinese and spent much of my youth being dragged around Chinatown near L.A. by my grandmother and 6 or 7 aunts. So the 99 Ranch Market brings back memories...some fond...some not quite so. But, at any rate, the prices are great and the selection is good and authentic (when it's in stock). The cashiers could use a little dosing from the friendly fairy, however. Then again, I don't remember many friendly cashiers or clerks at any of the stores I frequented as a kid...so I guess it just makes the experience all the more genuine for me.
I would recommend going on a weekday, or, if you must go on the weekend, just avoid going around lunchtime. There's a dim sum restaurant in the same shopping center and the parking lot gets pretty jam packed with cars and pedestrians.