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The coupons you may have heard of is IRCs. (International Reply Coupons) Which yes, are available at your post office
These coupons will enable the celebrity to exchange them for the return postage.
I'm not sure exactly how much they cost, but 2-3 should be enough for each letter
Autographs Pending: Rodney Mullen, Shia LaBeouf, Robert Pattinson, Slash, Sir Alex Ferguson, Taylor Lautner, Lukas Podolski, James McAvoy, Alex Pettyfer, Mitch Hewer, Dominic Monaghan, Jack Black, Will Farrell, Oliver & James Phelps, Andy Roddick, Luis Nani, Cristiano Ronaldo, Dane Cook, Sean Faris, Josh Duhamel, T.I., Christian Bale, Paul Scholes, Darren Fletcher, Nemanja Vidic, Roger Federer, Gerd Muller, James McAvoy VV, Josh Holloway, Taylor Kitsch, Dimitar Berbatov, James Franco VV, Paul Rudd VV, Steven Gerrard, Daniel Agger, Fernando Torres, Theo Walcott, Jamie Carragher, Wentworth Miller, Mark Wahlberg
International Reply Coupons work out at exactly 96p each as I bought some today!
but letters do vary depending on if you want to send photo's etc...
a basic letter (no sae but not recomended) would be about 90p
if you want to send a cardboard back envelope with photo's you are looking at around £2
heavy duty cardboard packing pushes it up to £3
and any personal items would be very expensive
I sent a photo letter and comic to Stan Lee and it came to £5.40!- with return postage you really have to want it for £11!
dont let this put you off though its an amazing feeling when you get your first auto!