Hi,
We completed a couple of weeks ago, I would agree it is well worth a trip to Cartagena to go to the big Carrefour on the Parque Mediterraneo, also on that site is a very good builders merchant where you can get everything you would in a large B&Q, really good quality inexpensive light fittings etc. Also opposite in the same place is a shop called Media Markt which is a massive electrical shop with a great selection of Tvs & DVDs, we bought a TV in there that we saw later for sale in Mojacar for nearly twice the price.
Happy Shopping
Mike & Chloe