When I visit Spain I always collect receipts and bills for use in the classroom, such as a receipt from a supermarket on the Costa Del Sol.
It's quite easy to photocopy the receipts on to A4 size transparencies. I reveal each item a bit at a time and students have to work out what it is.
I finally ask them "@cu nto es? - how much is it?" They then have to suggest a price in Spanish. The nearest to the correct price can choose a prize.
It's excellent for number revision and practising accents.
For a paired-up exercise the receipts can be saved as a Word document so I can add whatever I like to the list.
The students are asked to compile a shopping list for a picnic from the items shown on the receipt, telling me what it is that they want and how much it will cost.
This is good for number revision and use of target language (Quiero, Quisiera) and the focus on food, drink and fun is always popular.
Part-time teacher of Spanish, Nelson and Colne College, Lancashire