I can not tell you places. I bougth once in a place I can't remember, and a couple of times in "La Vaguada" kind-of-mall Alcampo supermarket some blankets, in sales.

But "nordico" is short for "edredón nórdico" which means "nordic style quilt".

sheets/sábanas
pillows/almohadas
mantas/blankets

Conforters? Sorry, I don't know what that is.