We got the outside ones from the DIY store just down the road in Campsol, for inside we too went to Leroy Merlin. They also have a store in Murcia at the Stadium which is just across the motorway from IKEA.
Fitting the lights is a doddle, particularly the inside as you can pull down the conduit and cables, connect up without fiddling with short wires, breaking your neck or getting snappy at the wife for hassling you over something trivial. Then you shove all the excess back up through the hole.