You can pick them up at pool supply ships too, although they will probably charge more for them.
Glad you guys were mentioning this though as I was wondering myself what to get to top a dewar 
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"Don't You understand? This is Greek to me! Except I spek Greek, this is like Aramaic to me, and not the Western Dialect I can read a little." - Dr. Walter Bishop
Special relativity is not "Eat Two Big Macs."
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