Can anyone who has ordered from the UK and have used USPS, let me know if they were reliable. It is very expensive, so I don't want to waste money on this method if they are totally unreliable. It mentions using UPS Worldwide Saver, but doesn't give this as an option when completing the ordering process, therefore I was going to go for USPS Priority Mail. I'm going to hold off until I get some feedback, but I have a teenage daughter desperate to get rid of unwanted spots, so if anyone could quickly pass on their experience I would be very grateful.