I think you mean Maranta and Calathea? Sorry, I don't buy plants through the mail, but I've been to Glasshouse Works (which also offers mail order) in person and have been happy with the plants I bought from them. They probably have some of these.

Calathias are available at Home depot--quite often! Maranta (Prayer Plant) you do not always see. Sometimes when HD gets in it's assortment of premium HB's, there may be a few Marantas among them. Go check!