Overview Latvia Stamp Catalogues
Latvia Stamp Catalogues (books)

Latvia
Latvia Stamp Auctions/Marketplaces
Catawiki
Ebay
Stampden Latvia Stamps

Latvia 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
Former Soviet Union (English) – Stamps since 1991 with Michel catalogue numbers and mint and used prices
Latvijas Pasts (Latvian) – All stamps since 1991 with extended description
Ukrafil (English/French/German/Russian) ā Stamps since 1991