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http://www.amazon.com/Penn-Champi…ge_o00
Amazon has 12 cans of Penn balls for 22.27$ +tax.
Prime shipping eligible. This is brings it down to <2$ per can of ball for all your tennis needs.
It is equivalent to the past deal posted at https://slickdeals.net/f/8530603-penn-championship-extra-duty-tennis-ball-case-12-cans-36-balls-22-27-free-store-pickup?src=Site
but from Amazon.