I'm so glad they clarified this:
http://www.kijiji.ca/v-view-details....dId=1014507939
"
FOR SALE ZIGZAGER FOR ONLY 199.00 DOLLARS. NEVER USED.
a Zigzager is like a sewing machine that sew the edges of your clothing material so that it will not fray. "
Because I was mistakenly calling them sergers or overlocks....