We have pathtags made for us. A design usually runs anywhere from $15-$35, depending on who does your design and it costs about $105-$110 to produce 50. Of course, the more you produce at one time, the cheaper it is.
I like them because they have a tracking number on the back, just like a TB, but you log it on www.pathtags.com instead of the geocaching site. They are a lot of fun and there is a who community that also offers trades, so you can start your own collection.
Prior to finding pathtags, I used business cards but those would get wet. I then went to self-made stickers, again those would get wet or yucky. Besides, I couldn't see where they went.
Some interested party attached a TB to a pathtag and got a two-for-one deal on tracking
It's all about the game!!! Have fun