Alright, Coinpayments supports handling BCC, well they have a merchant directory: https://www.coinpayments.net/store-directory
Basically, we need to comb through and see if its worth adding these sites, then actually do it. I am thinking it might be easier to script a scraping tool to compile the list and urls for us and then proceed verifying the information and seeing if they support BCC yet. I have checked a few sites and while they accept Bitcoin (obviously) they have nothing indicating during checkout or before checkout that you can use bitcoin Cash, so I assume they have not decided to accept it yet.
This will most definitely suck to do, but its a large list we could add and all of them could use a more targeted message, like
Coinpayments supports #bitcoincash, it would be great if you could too @[companynamehere]