One way to save money is to use self-inking stampers rather than purchasing labels. You can actually use them for anything you find yourself doing over and over again — like your return address for your envelopes.
iPrint has a close out out on self-inking stampers right now. You can save 35% off of the list price and get them for as low as $5.19 + $0.88 shipping — for a total of $6.35 shipped! That is the cost for the smaller size. You can get one a tad larger and pay $5.84 + $1.13 shipping for a grand total of $6.97 shipped!!
I have one of these and I absolutely LOVE mine!!