im at madrid right now, the scene is tight, there are graff stores all over, specially in the center-historic part of the city.
check out:
triburbana - def nice place
buho 13- montana cans for 2.15 euroes
tiempo libre - spanish and other montana, OTR's, the works
autentico estilete - another tight store w/ a lot of shit...
for more info, pm me or email me...
good luck