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I'm sending to Germany and I have no stamps for the SAE, so I'm going to use IRC's. How many would I need to put in an envelope to cover the postage? I'm not even sure how much an A4 hard-backed envelope with 2 photo's inside would cost to send back to the UK, and I have no idea what value an IRC has in Germany anyway.

Any help would be greatly appreciated.

IRC's have the same value no matter what country that you send them to. Not sure though how many you will need.