Hmm, I'm in Washington too, wonder if my local Dollar Tree has the same deal, guess where I'll be heading tomorrow!?
Depending on how much you use, Costco sells it in 50lb bags...
yeah costco all the way is the best. 50 lbs for 29.00 I never thought I would use that much PS but my bag is almost gone!
I sure wish I could get Domino's ps here in this area ~ they have 1 lb boxes that the sugar is sealed in plastic and not the waxed paper and it is sifted 10 times too! No air gets in it at all, therefore, you don't need to sift.
My favorite for sure! 
Buying 50 lbs of ps would last me 5 years to use up that much. 
I sure wish I could get Domino's ps here in this area ~ they have 1 lb boxes that the sugar is sealed in plastic and not the waxed paper and it is sifted 10 times too! No air gets in it at all, therefore, you don't need to sift.
My favorite for sure!
Buying 50 lbs of ps would last me 5 years to use up that much.
Not sifted 10 times. 10x means it's a smaller granule than 6x
Mike
10 x does refer to the size of the granules.
http://www.pastrysampler.com/Questions_and_Answers/10x.htm
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