I use Maxi-Lock. I've tried others and didn't really have any trouble except the color selection was limited. The former Atlanta Thread Co. now Wawak sells Maxi-Lock for 1.99 a cone. Can't beat the price.
http://www.wawak.com/products/category.cfm?cID=1326
Last edited by Mitch's mom; 07-07-2012 at 12:34 PM.