Yah, madame francis is commonly found in stores here in south florida. Unfortunately, the only mangoes that can be found at the supermarket are: keitt, ataulfo, kent, madame francis, and tommy atkins. Of the group, I ataulfo is the best tasting mango to be found at the supermarket. But, even it is a throw away mango compared to a backyard grown lemon zest.
I'm not sure we'll ever see lemon zest mangoes at the supermarket. Industry tends to converge on 1/2 dozen varieties that have been selected for disease resistance, shelf life, shipping, and production. It's unfortunate that you can nary find a florida grown orange, much less a florida grown mango, from any of the supermarket chains here in Florida.