With all due respect, there is no reason to go to Barajas pueblo to buy a cazuela. You can buy cazuelas at dozens and dozens of spots in Madrid. Any ferretería (every neighborhood has one or two), Todos a Cien (dollar stores), bazars, supermarkets, El Corte Inglés, the Rastro... They are everywhere.
If you are looking for a fancy one, you might try the cooking store Alambique in Plaza de la Encarnación--though they were undergoing renovations the last time I was there and had limited stock.
Also, a lot of meat guys have a little card with an illustration that shows how the cow is cut up.