Sue Dodd from Sydney Markets has some great recipes but when I saw the pic above I decided that she has excelled herself.
Popcorn Cauliflower? Brilliant. Find the recipe here.
But if the price per head is still too high for your budget you could always try frozen.
Word is snap-frozen vegies retain their nutrients. Here is an article from a few years ago that gives some insight.
With that in mind, take a look at Jamie Oliver's recipe for Cauliflower Cheese made with frozen veg.