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I was at Lowes in Chillicothe, OH and they had 4’x4’x.22" Optix clear acrylic sheets (Plexiglass) on clearance marked down from $ 119 to $ 29.98. But when I got to the register, it scanned $ 17.17. Sure enough, shows $ 17.17 in the app for that location.
Definitely a YMMV as my closest Lowes shows regular price.