The only commercial GMO tomato I ever heard of was the "FlavrSavr" variety that has not been sold for around ten years (fortunately).
According to Wikipedia, "Currently there are no genetically modified tomatoes available commercially,"
I THINK that there have been some field trials of GMO peppers, but I'm pretty sure none have been approved for commercial use. If true, not even Wal-Mart could sell them.
My own main beef with GMOs so far is that they are only created to increase someone's profits, not to reduce food prices or to increase nutrition, taste or sustainability, or to decrease hunger where people can't afford tons of irrigation, fertilizer, tractor fuel and 'cides. I hope that the newer "CRISPR" GE technology is used by more organizations with goals other than "corner the seed market and impoverish everyone but our customers". "NGO GMOs" might be much more humane in their goals than "Monsanto / Syngenta / DuPont" GMOs.
I've never seen or heard anything good about seeds sold at Wal-Mart. The cheap packets are so small that they aren't even really cheap. And Wal-Mart squeezes their suppliers so hard that the motivation to cheat, skimp or lie is great. I'll keep buying seeds from places that respect their customers AND their suppliers, and try to sell a fair product for a fair price - not shoddy goods at prices unfair to suppliers.
