Despite all the horror stories I have read about these guys, I have ordered boxes of mosses, plants, and bulbs from them on multiple instances over several years with no incident.
Even after getting held up 2 weeks in customs their plants make it to me alive. My only instance (out of 10+) of plant melting is when I bought mini pellia, which they promptly refunded.
No issues at all with customs, they have even opened every package and taped it with "inspected by customs" before sending it to me. Oh, and every single order has been over $30, so it's not a small box.