Ok...I finally listed those last two necklaces on Thursday along with another I haven't posted here. The pink & black one sold within a few hours! I journeyed up to Michael's yesterday in an attempt to buy several boxes while I got off my butt and try to order from Uline. Much to my dismay, they were out of the square boxes. So I kept searching around the shelves until I found this one and fell in love:

I went to the website listed on the bottom of the box http://www.darice.com. Awesome, BUT I have to have a store front in order to purchase from them, as well as a 'minimum' yearly purchase amount. http://www.darice.com/ecom/ViewContent.aspx?sectionId=2&cmid=2003. I hit the intarwebs late last night and found them for $2.29 at Create4Less. With shipping, it's still probably cheaper than Michael's when you add taxes for the store purchase.
So, I am trying to decide whether to buy some of these and suck up the costs, or go back to Uline and work with their great deals for the smaller rectangular ones.