Convenience store combined great, cheap Thai food place open for lunch? I'm there!
They serve a variety of Thai curries (usually pick from four on any given day) and related Thai sides. They also have wraps and sandwiches if you're more into standard fare stuff. All below $7 for good portions. This place is locally owned and run and the [Thai] family that owns it and cooks the food is incredibly hospitable and speedy.
Not really that much seating (maybe two tables for two and one table that might seat 4) so perhaps better for a grab-and-go.
I think this is a great alternative to Bahn-Thai across the street - much less expensive and more tasty.