Right now, you can get 10 trees for purchasing either a 6 month or a 1 year membership. The cost is $10 for 6 months or $15 for a year. They give you over 10 different package options (which will vary depending on where you live). You can also choose to give the trees as a gift or donate them to a National Forest in need of reforestation. Take advantage while you can. I'm not sure how long this deal will last.
Photo Credit: Arbor Day Foundation