When American students see prices in other currencies for the first time, they are blown away by the perceived "sticker shock." "How come that candy bar costs 1000 dollars?" they ask.
Getting students curious enough to ask questions about something outside themselves is a victory all by itself. This activity leverages that curiosity by showing actual prices (in Mexican pesos) of familiar products in a Mexican grocery store flyer, like the sale papers they might browse on the web for their own favorite store.
The students are then tasked with figuring out how much those things cost using the money that is like what they are carrying around in their wallets. Along the way, they'll see lots of food and entertainment vocabulary and quite a few cognates. You will hear them say things to each other like, "Hey, look, they have Blu Ray, too," and "Detergente...that's detergent!"
For your more advanced students, there is also a follow-up activity that has them practicing mathematics and metric conversion in Spanish, as well as asking them relevant cultural questions.
Standards are listed in case you are asked to documented that sort of thing, and the assessment has a key included. Thanks for giving this a look!