Overview Norway Stamp Catalogues
Norway Stamp Catalogues (books)

Norway
Norway Stamp Auctions/Marketplaces
Catawiki
Ebay
Stampden Norway Stamps

Norway Online Stamp Catalogues
Michel (German/English) – Most complete online stamp catalogue with actual prices (subscription required)
Colnect (all language) – Colnect (premium) has auto-matching, best matches and an extensive free stamp catalogs
Frimerkehuset (Norwegian/English) – All stamps of Norway