Etsy is my number one stop for cards these days, and there are some great artists there with great prices. Here are a few shops I have come across.
Airport love story Has great note cards. I fell in love with these my first week on etsy, and since then she has added even more to love. http://www.etsy.com/listing/46207947/life-is-a-carnival-set-of-18-vintage
Little Pink Kangaroo has a whole shop full of fun and spunky cards for any and all occasions. She is constantly adding new additions to her shop, and I find myself buying more and more each week.http://www.etsy.com/listing/46239274/youre-sweet-card-with-envelope
Paintedandcreated, doesnt specialize in cards, she mostly does canvas paintings that I adore, but she does have the option to reproduce her paintings onto a card, and believe me, her paintings are great, and well worththe money. http://www.etsy.com/listing/45449209/three-custom-paintings-designed-for-you
There are other great shops on esty, and you can find all of my favorites in my shop, by searching through my favorites. My esty shop is: www.tamiscozies.esty.com
Please mention where you found these great shops when you order from these great shops, thank you.