According to 2ndvote.com, Amazon is 1.5 or very liberal, while Barnes and Nobel is 3.13, moderate/neutral. They don’t list any other bookstores.
If you wanted a conservative alternative to Amazon for most products, they recommend Overstock.com
What an interesting site. Thanks for posting it.
I had just assumed Overstock was a leftist site because of the notice they had on the top of their homepage last year giving full-throated support to Black Lives Matter, blaming America as racist, saying they would focus on hiring people who aren’t white, and giving a paid day off for their workers to go vote. I was avoiding them, but it looks like they are still clearly better than Amazon. I wouldn’t call them “conservative” though.