Curtzey---when you mail something to yourself whose return address do you use?
Good idea about mailing 0.40 paperbacks!
One bit of advice, i go to the local thrift store and buy paperback books. Usually 5 for $1 and two go over a pound, so my cost is only 0.40. I pick ones my mom might like and send them to her. I also mail a bunch to myself when i travel to the next zip code.