I made 140 labels for my son's teacher...the labels are free so I just paid for the shipping.
Here's the info on how to do it...
To get started, go here.
Click on Return Address labels (it's the second item in the second column in the center of the page)
A pop up box will appear.
Under the Browse by Industry drop down box, select Education.
Then browse that page to select the design you like the best.
Shipping is just $3.04 - $3.34 depending on the speed you select.