by Vera H-C Chan Yo quiero a calorie count. For a mere $2, reports the USA Today, fast-food gourmands can get a taco or burrito, a fizzy pop and chips at Taco Bell, starting this Sunday. That's a buck less than a McDonald's threesome from its dollar menu.  At a time when people line up for free hand-outs (a la the Oprah-KFC kerfuffle ), the deal's a steal, and might even tempt bargain shoppers to double up.