You might be surprised how many Chinese takeout places will happily part with some steamed broccoli and brown rice for a reasonable price. Sure, it's not on the menu, and most of what is may well be covered in sugary sauces, but at least in my experience, they tend to be a pretty reasonable bunch when it comes to just selling what they have for the right price.

Though I'm in the Northeast -- your access to wildly abundant Chinese takeout may vary.