Simon/Lagniappe does a great job and will certainly save you trekking about town (argubly not the first thing most people want to do on vacation.)
We (Rojo MRKT) DO carry a complete selection of fresh produce, fresh baked breads, seafood, deli meats, cheeses, a great selection of CA wines, beer, prepared foods, home made ice cream/desserts and daily specials. We're a little over a mile south of Costa Maya.
Mata Grande Grocery (a scant 1/2 mile further south) has a great selection of snacks, dry goods, cereal, pastas, ice cream, soda/beer/liquor, etc.
All said, it's a LOT easier to get a wide selction of goods up north nowadays.
Enjoy your trip!!!
Jeff / Rojo Lounge