Many vets hold a supply of sample packs of two or three brands of complete feed. (thebullterrierclub.org)
I'm just now learning about essential oils and got a little sample pack from a midwife in my area. (homemademommy.net)
Their website has a free sample pack if you would like to try all three before committing to an entire box, all you have to pay is $ 2.99 for shipping and handling. (babydickey.com)