We went up for the Lucha Libre, and returned to experience the gigantic market which takes place every Thursday and Sunday. Anything you can imagine is on sale here. It might be easier to list the things you can't buy in El Alto's market: javelins, circus elephants, wine bottles filled with rat heads, and midget fetish porn. That's it, and actually, I'm not so sure on that last one.
If you're looking for a quick and incredibly cheap lunch in small, cramped quarters, you can't go wrong at the the gleaming new Mercado Lanza near the Iglesia de San Francisco. With hundreds of stalls serving food and juices, you'll definitely find something appetizing. Just don't be squeamish about sitting shoulder-to-shoulder with strangers.
Tell you what. If you ever decide to go for the Guinness record of World's Biggest Fruit Salad, do your shopping at Sucre's Mercado Central. You'll find hundreds of thousands of women selling billions of fruits. I mean, even if every person in this city ate a dozen bananas, six apples and eighteen pounds of grapes each day, there'd still be a surplus. Never heard of supply and demand, people?