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Okay i'm from the UK and I want to send a SASE to Danielle Panabaker BUT they do not do IRC's here anymore and I also cannot get US stamps.
I can send a letter to the USA just fine but getting a letter back seems incredibly difficult.
Does anyone know what I should do?
Should I just stick a $5/£5 note in the letter so they can use it to buy a stamp?
I really have no idea.
You're help would be much appreciated.

Bri0626 sells US stamps here on the forum in the Autograph Exchange/Sale section.

Otherwise US cash would be fine, get $1 bills and send 2-3 per request

Is it illegal to send money from the UK to the US?

No I have never heard of that. Many members here from the UK do that just fine.