ArtFarm out east has lots of produce--I follow them on facebook where they post opening times and what they are selling.
Ridge-to-Reef farm does a CSA (community-supported agriculture--pay upfront for 3 months, get a box of veggies--this week there is bok choy, argula, turnips, basil and a bunch of other stuff-- each week from whatever they harvested). You might want to email them and see if they have shares left. First pickup starts today.
Fresh kale and bokchoy, collard greens, arugula and some other vegetables are actually not that badly priced at Plaza West. They get more expensive at Foodtown and Plaza East. I've never been into the juicing thing down here because of the prices. And frankly, I don't think its truly necessary for maintaining a really healthy diet. Eat a mostly plant (with some lean meats-hormone and antibiotic free- and fish) diet, 100% whole grains for carbs (brown rice, quinoa, whole grain pasta etc), eliminate processed sugar, lots of fresh fruit, some good spices and herbs and you're good to go. A once in a while juice/raw cleanse can't hurt though!
I've actually found that it is easier to eat better down here even when going out because many of the restaurants use whole ingredients. Restaurant food in the states, especially at the chains, is mostly processed and filled with junk and sugar. I'd rather eat a good chunk of real, Irish butter and a good ful-fat brie cheese on a home-made bagette than a supposed "healthy" Subway sandwich (hint--meat is not supposed to have 20+ ingredients in it).