SirKonstantine, your high budget does not surprise me one bit. It is not uncommon for fruitarians (those who only eat fruits (and sometimes vegetables)) to spend up to 1000$ a month on groceries. Shit is expensive, especially if you buy all organic fruits and vegetables. To be honest, it kills me that we probably subsidize cheap sweets and junkfood. Healthy, natural food needs to be affordable for everyone. I know quite a few people around here don't give a shit about healthy food. I was the same and do understand. But since i started to develop a consciousness for my body and its processes, i switched more and more over to natural foods, fruits and vegetables. I now FEEL the food i put in my body. Eat all the burgers you want, eat fries korean teenager style..whatever. But you better have a pretty resilient body.
I would try to buy non-organic when it makes sense. For instrance, if you only eat the red part of watermelons, you may as well buy non-organic melons because pesticides won't penetrate this deep, arguably. You can also juice the rind though...
I'd also try to buy what's in season and use that as a baselayer. For instance, in autumn, i'd heavily rely on apples, in winter on oranges, in summer on peaches and melons and in spring on carrots to make up for the majority of my juice. Apples and carrots make fantastic baselayers all year round. Then spice it up with more expensive stuff like fenyl or various herbs and greens.
Also, for leafy greens, consider an auger juicer...i got a handcrank one for 80$, electric ones are very expensive, but they extract a lot more juice!!
The last tip: Look in your area for wild herbs and vegetables. This may sound weird, but it helps connect you with earth and shit is free. Stinging nettles for instance a great, nutritious and healing...another one: Dandelion. Make sure to use plenty of apples to mask the taste because that shit is strong.
I'd really look into adding fruit to your juices because all green surely is EXTREMELY expensive. You might also want to look into a hydroponic setup to grow vegetables, but im not sure if you'd safe that much, probably not.