I send international reply coupons with QSL cards. They no longer sell them in Ireland, where I live, but you can still order them from Swiss Post, online. They

I send international reply coupons with QSL cards. They no longer sell them in Ireland, where I live, but you can still order them from Swiss Post, online. They work everywhere. They mail them to you for free. https://shop.post.ch/en/packing-sending/sending-letters/registered-prepaid/international-reply-coupon/p/554094 https://shop.post.ch/en/packing-sending/sending-letters/regi...