Some of the more budget friendly dog foods out there would be
TOTW ($36 here locally for 30lbs), Acana ($50ish here locally for 28.7lbs), Go Natural ($55 per 30lbs i believe).. There are more than that, for the quality and the price TOTW is probably the best bang for the buck, though personally i view the food as not up to par on the best food out there nor is it the worst.. Its a good mid ground for someone on a budget.
Theres nothing wrong with feeding a dog not the best of the best, all dogs react differently so what one may perceive as the best may not be the best for their dog or needs.
Even though i do try to educate on the subject in the end not all dogs can handle the same food. There are many variables, the biggest thing i try to do is to show people more of whats involved and how not all dog food is created equal, not to take food on the cover alone.. What may appear to be healthy isn't always the case.