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Amazon [amazon.com] has IRWIN Tools Standard Drywall/Jab Saw (2014102) for $ 3.99.
Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location)

Features:[list][*]Rigid blade delivers solid cut control.[*]Bi-Ground teeth delivers fast, smooth cuts.[*]Hardwood handle is comfortable and balanced.[*]For roughing in drywall, cutting out HVAC, plumbing, and electrical openings or cutting ceiling tile openings.