Health food is often known as expensive, and for good reason. Organics? Beyond. Go to your local organic grocery and you will notice that the kale is almost $5 a bunch, the bananas despite being significantly smaller than regular (weird that...) are much more pricy and avocado - don't even go there. Here's my guide, and if you follow it, you'll have extra coin in your pocket for that Saturday girls lunch.
The number one tip is: shop at markets! I can't emphasise this enough - it's not only extremely cost effective, you're also supporting local growers and able to access a variety of seasonal produce. Buy the essentials here - greens, herbs, apples, grapes, strawberries, carrots - foods like these are more important to buy organically as you eat the skin - so if it's been sprayed with herbicides then you will ingest it.
Top tip two is to actually eat it. I know this sounds kind of obvious, but you're probably not going to save hard earned cash if you're eating out every night and the aforementioned kale is rotting away in your fridge drawer. The key here is to know how to use it - if you're not a Masterchef, then take the initiatve to seek out recipes and create them. Knowing this is fundemental to most people is the primary reason I have so many recipes on this site - use them!
The final tip in budget living is to do with poultry / meat products - sourced at a wholesale butcher, it can actually be very cheap. Buy in bulk and keep it for a few meals - freeze if need be. Hormone free is super important here too - unless you like the idea of foreign hormones entering your body, of course.
Overall, this might seem like a pain in the ass - but if you don't invest the time and energy in your health and nourishing yourself properly, you will pay big time - in the form of low energy, recurrent illnesses and chronic disease. Save yourself later by looking after yourself now.