I am looking for a list of e-commerce websites or any other platforms from where I can buy crypto mining hardware and all other accessories for it.
E commerce websites you can find some of the users on Ebay may accept the bitcoin as the payment mode buy the old mining cards and ASIC miners. Here on this forum, you may check the child board called hardware under mining section.
There you can find traders who sell and buy the mining hardware. I believe 90 percentage of the people will accept the bitcoin as a payment then please use any trusted forum escrow if you wish to deal with them.