I’m in the UK and have been asked to send some back to the US within 3 days. What is the cheapest way to do so. Western Union? Express Mail with a personal check? Carrier pidgeon?
PayPal is the cheapest if both you and the recipient have accounts.
You might also want to check out xoom.com – they advertise as being substantially less expensive than Western Union.
Did anybody else read the Thread Title as Monkey Transfer from UK to USA?
No, but now I wish I had… 
Joe