WRT Etsy, I have purchased several hundred $ of scores of seed varieties from perhaps 3 dozen vendors.Was always pleased. Art would fit in well there since artsy stuff was how they got their start and it is still their mainstay. There have been a few occasions when I found something on Etsy, not available on Ebay.
I don't care much for Amazon other than books. I have made perhaps a dozen purchases and was unhappy with virtually all of them other than books. For books, I have been 100 % joyful.
As a long time Facebook user, I think that would definitely be worth investigating. I personally have never purchased from there.
@Drdawg - do you have a problem with Ebay? I have made thousands of $ of purchases over several hundred transactions. On only one time did I have a problem and it was quickly fixed.