Last september i succesfully bought and used a Prepago Datos SIM from
Carrefour Movil along the Costa Brava. This supermarket chain does offer a daily rate, 'Bono 1 Gb' and 'Bono 3 Gb'. This last one costs 29 euro and is valid 30 days. After 3 Gb, the speed is 128 Kbps.
More info:
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http://carrefour.es/telecom/internet.../bono_3gb.html
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http://prepaid-wireless-internet-acc...in+-+carrefour
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http://www.prepaidgsm.net/forum/tags...r%20movil.html