That's so awesome. Organic produce is expensive where I live, and so it's a good investment of time.
I'm in a similar situation, and I expand a little bit every year, and plant weird things in weird places. The "flower garden" out in front of the house now has garlic, potatoes, horseradish, mint, chives tucked into it. I grow hops on the fence, and stuck a few fruit trees in a couple of years ago. I think our garden is up to about 400sq ft this year plus those weird things, all with soaker hoses on quick-release fittings so I can just walk around and switch the water, and heavily mulched to conserve moisture and keep weeds down (we're in the dryish foothills of Colorado)
I don't weigh things, but whenever I harvest something or make compost, my brain does the math, "$2.50 right there for that basil. Big bunch of organic tuscan kale, $2.00. That would be a $4.00 bag of steer manure right there...."
Goblin chief, we planted pumpkins this year too. There's something gratifying about a plant that grows a foot a day...