From Reddit. Apparently it's starting December 26th.
http://www.reddit.com/r/Aquariums/comments/15asm4/dollar_a_gallon_sale_at_petco_after_the_holidays/
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http://www.reddit.com/r/Aquariums/comments/15asm4/dollar_a_gallon_sale_at_petco_after_the_holidays/
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