We've only ever bought small kitchen items from Euronics (new kettle & toaster)
I think Eroski do Fridge/Freezers - we bought a TV from there recently and got a realy good deal.
There is also the dreaded Carrefour.
Plus MediaMarkt at Zenia boulevarde do a small seection. Have a look at this one - it's €399
http://tiendas.mediamarkt.es/p/frigorifico-combi-balay-3kfb7611-no-frost-186cm-a-1146506