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I am looking into buying UK stamps for return SASE's since I am unable to buy IRC's in the small town I live in. But I'm not sure exactly what type or how many stamps I need to buy. Can anyone give me a suggestion for the type of stamps and the number of stamps I would need for return envelopes that weigh between 4 - 6 ounces (I believe that is 140 - 170 grams)? Any help is appreciated!!!

HERE you can calculate your postage price, it also shows you what stamps can you use
Hope this helps
Urša

That's exactly what I need -- thanks so much for the help!!!!