Join a Co-Op - Join a Farm Co-op or a Community Supported Agriculture (CSA) group. You can purchase a share in a local farm and in exchange, you'll get a portion of the food that the farm produces. You can find an organic co-op or CSA in your area by going to Local Harvest.org.
Buy in Bulk - Warehouse stores like Sam's Club and Costco have great deals on organic produce. Go shopping with family members or friends so you can share the cost and split the merchandise.
Find Coupons Online or at Natural Grocery Stores - Earthbound Farm has coupons on their site. (You have to take a quiz in order to get a $1.00 coupon.) My local Whole Foods sometimes has coupons available inside the store. Also, check out Mambo Sprouts for online coupons.
Look For Low Cost Produce - Search for reduced prices on produce that needs to be used right away. I often find bags of organic spinach and veggies at Kroger that need to be used within 1-2 days. They are sometimes 50-75% off the original price!
Check Circular Ads - I've noticed that some local grocery stores advertise sales on organic produce. Walmart and Meijer have sales on organic produce often!
Grow Your Own Produce - Plant an organic garden in your yard. You can even grow some veggies on your windowsill if you don't have space for a garden. You may spend a little more for organic seeds, but you'll save money in the long run!
Shop Locally - You can find lower priced organic fruits and vegetables at local Farmer's markets. If you don't have any markets in your area, then look for locally grown organic produce at your grocery store. The price of local produce will be lower since they don't have far to travel.
Buy Produce That's in Season - All produce is less expensive when they are in season.
Cheapest Fruits and Vegetables Month-by-Month (Frugal Living section of About.com)