Do you subscribe to, or receive with a membership, any magazine or journal that goes into the (paper recycling) bin after you have read it? Would you be willing to post that on to a mission worker instead?
Alternatively, would you consider starting a subscription specifically so that mission workers or their family members could regularly receive a magazine that they would really appreciate?
Or perhaps you are in contact with mission workers and could ask if they would like to receive any specific magazine or journal?