Yep Google Maps is out of date (summer 2010?) there is a newly built "Walmart" at that location. Opened maybe 4 months ago. It's owned by Walmart but it's not as big as a proper Walmart and called Superama.
The Superama that Yogi is talking about was completed after the google vehicals came through. It's there though. And most of the time the bus driver will not let you off at that light. The first stop out of the hotel zone is a block up the road, so you will have to walk down the hill and then make a left onto Bonampak. Superama is a Walmart Co, but smaller with less variety and more expensive. Better to stay on the bus for 5 more min and go to Walmart. Steve, you type so much more faster then me!
Think we posted at the same time Tori, but yeah I agree the bigger Walmart is probably worth the extra few mins on the bus for a more varied selection and better prices.
There are convenience stores OXXO stores in the hotel zone but not much in staples such as breakfast foods, etc. But the prices are much higher then Wal Mart. So the trip is worth the time but it does not take hours rather about 30 minutes each way.
You can get most things in the supermarket opposite the Presidente on the Hotel Zone. It is more expensive though. Have a good trip.