I go to the Westside Market almost every week and I love it!
Tips and Timing:
The market gets packed by 10am on Saturdays no matter what the weather is like. It will not slow down until after 2pm. If you want good deals go around 4pm. The vendors are trying to get rid of the stock for that day. Otherwise I recommend going in the morning prior to the rush.
Top Vendors:
If you are walking in from the parking lot the top two vendors for produce are located right when you walk in. If you go the left aisle... go to the first stand on the right. Everything is local and organic. Their herbs are $1 each and fresh you can not beat that! If you go straight the first vendor on your left has excellent pricing and local produce. Make sure no matter what stand you go to check what you are buying first. Once they get to know you they will hook you up with deals.
Gyro Stand-get there before lunch. It is worth trying these gryos at least once. They are very tasty!
Smoothie stand-a little on the expensive side but worth it! All fresh and local fruits. It also has the ability to rejuvenate any fun you had the night before :)
Popcorn Stand: Free popcorn samples and I recommend buying a bag they have many different flavors to choose from.