The website you link to is for another Roberto's Taco shop. The Hialeah taco shop is not on their list of locations. Also they moved a little down the street from there. Now there is a Chipotle's. Besides Roberto's Taco shop is cheap mediocre Mexican food don't waste your time.
Best Fajita Miami 2009 - Roberto's Taco Shop
In La Ciudad Que Progresa, you can get weary of eating vaca frita, lechón asado, and other ubiquitous Cuban delicacies. You'd be hard-pressed to believe that you could find something other than good Cuban cuisine in the city that Raul Martinez built. But from the Palmetto Expressway, head east on 49th Street, Hialeah's main thoroughfare, and make a right into the shopping plaza with the Winn-Dixie and the T.J. Maxx, just before West Fourth Avenue. Park your car next to the gray and red building that resembles a fast-food joint and go inside. Here ranchero music has replaced the merengue and salsa soundtrack. The beat is perfect for ordering shrimp, beef, or chicken fajitas, served on a sizzling metal plate accompanied by Mexican rice and refried beans. And they will set you back only $8.91. Try the shaved radishes, lettuce salad, plump jalapeño peppers, and refried beans alongside your tortilla chips. And all of it won't cost you more than seven bucks. Roberto's Taco Shop is open seven days a week from 10:30 a.m. to midnight.