In Oslo, there is a shop in the end of the street Markveien (in the popular and trendy Grünerløkka area). I can never remember what it's called(could be "Skaperverket"..?!). It's a really cool shop with art prints, upcoming and new designer things - such as clothes, note books, and everything from lunch boxes to earrings. And they have the sweetest and funniest greeting cards! So I always fill up my stock when I visit that shop!
They have a lot of cards from Papaya!(they print on recycled paper) and La Marelle en papier(would like to illustrate for both companies!). Check out their websites, they sell a lot more than cards! I get really inspired by the artists, their motifs and the style that they use.
I always have to stop myself from buying to many cards in that shop..!