The best price I could find was a seller on ebay. Here's the small one:
http://www.ebay.com/itm/Igaging-6-1...584623?hash=item3606ef5eaf:g:XQsAAOSwV0RXq2TZ
They sell them individually or as a set of 3 w/free shipping. Shipped very fast too.
If going with Igaging brand, get the plus variety like in the link above. It's the newest ones. There are cheaper versions (all black) available but from what I learned, not made as well.