Your affordable eats list should also include Over the Edge, a short drive away in Northside.
Further along in Northside towards Rum Point, Sunday afternoon the Driftwood sports bar has a catered BBQ with substantial portions.
Roland's is indeed a "pay what you think it was worth" but keep in mind that he prepares exceptional fare. It's worth quite a bit.
Sunday eening there is a fish fry on the beach in East End near the Texaco station. Capt Herman does a nice business there, and you can talk to him about buying some of his catch on other days.
Finally, the drive into Bodden Town is worthwhile for Lorna Wood's Jerk Chicken stand. It's a roadside stand with very affordable prices.
Big groceries are in Georgetown at the moment. Another market is being constructed in Savannah at the roundabout where the Texaco station is. Another will open in the strip mall across the road from The Reef Resort, though I dare not guess about opening schedule. And as others noted... groceries are closed on Sundays by law.
