I just found a nice post that includes a map to local Farmer's Market. I have only been to Atkinson Farm. I have found some great deals there. I should go again. I haven't been recently, but whenever I went I was happy with what I found!
FYI: The Grogan's Mill Farmer's Market is back on! You can go every Saturday morning till noon!
The biggest Farmer's Market I have ever been to is a bit far at Canino's Market. (Go with a buddy).
A google search came up with this post.
Strawberries at HEB are $1.50 this week! You can also go pick your own at King's Orchard in Magnolia for $3.35/lb