The Pouch system is a cheap and reliable way to send letters to Honduras. It takes about 2 weeks for delivery. Postcards and one page letters ONLY. Send postcards or write a letter on one side of a sheet of printer paper, fold into thirds (like you were going to put it into an envelope, tape at the top, apply stamp to right corner and send to church headquarters at:
Hermana Alyssa Gisseman
Honduras San Pedro Sula West Mission
PO Box 30150
Salt Lake City, UT 84130-0150
Also check out DearElder.com - They offer all sorts of letter, mail and package options. One of which is sending FREE pouch letters online.