Get some $1 dollar bills from the post office or travel agency and include them with your request and explain in your letter why you have included cash.

I would include 2/3 dollars.

try looking on the forum for stamps which people are selling or for trade

Hey,

I have never wrote to america before and hope to write to the cast of greys. I asked at my local post office and they didn't know so im asking here.
When including a self addressed envelope back from america to the UK what do i need to put on the envelope stamp wise? Or do i include dollars for them to pay please help.