If your stamp collection is of only modest value, I highly recommend that it be donated to the Greater Houston Stamp Show (GHSS) Foundation, Inc.
This 501(c)3 organization works closely with the local Houston Philatelic Society (HPS) to encourage the educational aspects of philately, and to aid in collecting, studying of, and sharing of knowledge about postage stamps, postal history and all related areas of philatelic activities.
Each year, in September, HPS sponsors the Greater Houston Stamp Show. An integral part of the stamp show is their famous Beginner's Booth, where they distribute the donated stamps and other philatelic material to children. They also donate to home-schooled students, and the Boy and Girl Scout troops.
Please go to their website for more information on how you can donate your collection to this worthy charity:
Link to the Houston Philatelic Society (HPS) to learn more.