Not sure where to post this Jen, but it keeps on coming up so maybe you can Sticky it!
If you are having problems buying IRCs (Internationsl Reply Coupons) or don't like the huge price charged for them then you can buy stamps for these countries at these websites:
U.K. The Royal Mail: www.royalmail.com (Sheets of 100 only for £30.)
USA. The US Postal Service: www.usps.com (20 airmail stamps for $9.60)
N.Z. New Zealand Post: www.nzpost.co.nz (prepaid envelopes or stamps)
O.Z. Australia Post: www.auspost.com.au (prepaid envelopes or stamps)
Please add to the list.