Since the thread online shops wiki has reached the maximum amount of text, there was a suggestion to move the list of shops into the respective communities, so here is the list of online shops for the Netherlands.
Feel free to add more if there are some you donāt see in the list below.
Alternote
Amsterdam postcards
Artunlimited
By Kris
By Zenz
De Blauwe Maan
De Blije Luiaard
De Verderkijker
DewyCreations
Dieren kaarten
Dille & Kamille
Elpapel.nl
Envycards
Essencio.nl
Fairyland
Goedkope ansichtkaarten
Happy postcrossing
Hip en stip
Hollandsekaart.nl
Kaartstudio
Leuke post
Muller wenskaarten
Mymagicards
Natuurlijke foto
Nikki Smits Webshop
Nikkidotti.nl
Post & Papier
Postcards from Essie
Postzegel erop
Stationery heaven
Stationery world
Tinstarcompany
1001 kleuren.com
veer illustratie.nl
De neusjes
Etsy shops:
AroundtheworldWinkel
Decartograaf
JuliaSwanGoodies