UK Stamp Question

[KristinaJ917]

Hi, I'm looking for 4-6 UK 1st class stamps, but I live in the US. I've looked on both Amazon and the Royal Mail website and I'm a little confused. Royal Mail doesn't seem to charge nearly as much for shipping as Amazon does, and I know I put my address in correctly so it should be international shipping. I know it'll be a bit of a wait either way, I just want the best legitimate price. Any advice?