I once posted an AD on Craigslist and gave option of crypto payment and they kinda removed it. That was few years ago. Sad reality is that it is easy to get away with it as compared with paper money so scammers post fake items sometimes .
There are different online stores like that of amazon etc. which have started giving this facility to their customers of buying different kind of things by paying in the form of the crypto currencies like that of the bitcoin. If you are also looking for something like that, then you need to be careful while choosing the payment method and similar things like that and that you must go for some popular products.