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Looking in my local Lowes clearance today they had some 3" putty knives listed for $ 0.30, but when I went to self checkout it gave an error. Cashier came over and logged in, screen said something along the lines of item no longer for sale so he brought me to his register. Came up to $ 0.02. Good deal if you are already in store. Link is for reference only, and brickseek showed nothing in my store, but they had around 10 left. Other sizes should be a similar deal.