Don't know where you were looking, but MoissaniteCo. (Firecut diamonds) has an A- rating with the BBB.
But I would not put any value in that, as the BBB is a farce!
I have purchased all my moissanite from Moissaniteco. and have never had bad service, in fact, quite the contrary!
I know there are some on here that have not been happy with their purchases and service, but I have yet to find a business that never receives complaints. Life is such that you can't please all the people, all the time!
MoissaniteCo. would still be my recommendation, but there is also Schubach's. You can contact jcent on this forum as she is a representative for their company.
I'm still hot!! Only now, it comes in flashes.