We have recently joined two co-ops and I LOVE them!! They are a great way to get organic food, for significantly less money than the grocery store.
I'm part of a meat co-op that has Whole Foods quality meat at awesome prices. $4.59/lb for chicken breasts, 2.99/lb for ground turkey, and 3.99/lb for beef. The meat tastes so good too. We place our orders once a month by emailing the host, and then pick it up at her home in Colleyville, usually on a Friday afternoon. They will hold the meat for you if you can't come during the pickup window. There are no minimum orders. Email me at selahfalk @ gmail dot com if you want the contact info for the host. This is a local farm too, so I'm happy to be able to help support them.
I recently joined an organic fruit and veggie co-op and now we are eating a lot more fruits and veggies!! I pick up our share every two weeks in Southlake (but they have lots of locations). I've found the selection to be great - lots of 'normal' veggies, with a few new-to-me ones. This co-op gives you the variety in very do-able amounts. You don't end up with 10lbs of beets, for example. My last two orders had tomatoes, kiwis, apples, onions, potatoes, sweet potatoes, lettuce, avocados, kale, bok choy, carrots, oranges, mangos, blueberries, and other things I'm forgetting. There's also a swap box if you want to trade out something (bok choy for more lettuce or something). If you want to find out more about this one, visit their website. They also have a pretty comprehensive list of dry goods to order too.
Last but not least, Azure Standard is another good source for organic goods. They have recently started delivering to the DFW area. For example, pesticide-free oranges are .43/lb and organic apples are $1/lb this month!