CheapFoodMap

"This exists because restaurant listings rank by advertising spend rather than by which meals actually cost under ten dollars."
A crowdsourced US map of meals under $10. People drop spots with prices, vote, and comment; you browse by city or pan the map. No chain restaurants and no sponsored placements.
Our takeCrowdsourced maps live or die on contributions, and this one looks alive — the newest entries were price-verified within the last 48 hours. Houston, Chicago and Philly are deepest. US-only, so skip it if you're elsewhere. The maker commits 10% of profits to food banks and promises quarterly numbers.