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Amazon [amazon.com] has X-Acto XZ3601 No. 1 Z-Series Precision Utility Knife w/Replaceable Steel Blade for $ 5.99 – $ 2.40 when you ‘clip’ the coupon on product page = $ 3.59. Shipping is free with Prime or on $ 35+ orders.

Price:
$ 2.40 lower (40% savings) than the list price of $ 5.99
$ 2.40 off coupon applied