Etsy

I think Etsy is one of the most important sites for bringing buyers of artist driven and handmade craft together.  I routinely filtered through hundreds of artists on a weekly basis looking for someone with unique product.  It is true that you have to look through a lot of craft that does not fit your store, but at the end of the day it is worth all the trouble if you can find an artist who brings something unique to your store that no other shop in your area has. 

http://www.pbs.org/arts/gallery/off-book-episode-7-etsy/off-book-episode-7-etsy/

Now there are a few things you must keep in mind

1. Make sure the artist can meet your deadlines especially if it is a seasonally specific item such as scarves, Christmas ornaments etc...  There is nothing worse than getting in holiday merchandise on December 26th

2.  Make sure to get a sample.  As in dealing with anything on the internet, what you see is not always what you get. 

3. Make sure the product can sustain your mark-up.  Many of these artists do craft shows and web orders   and don't have a wholesale price.  You may need to double their asking price and the product may not be able to fetch your price.  This is where negotiating with artists becomes tricky.  I have had to say no to some wonderful product simply because I couldn't get a retail price for it.