In Benalmadena and Torremolinos you'll find it hard to beat Ruben's, cash for euros, exchange rates. And you get a free drink whilst you're waiting..................tea, coffee, soft drinks, local wine and spirits. Actually the place was full of retirees sat drinking and the first time we used it we thought it was a bar!!
Their rates can be found on the following site:-
http://rubenexchange.com/index.html