Amazon has 6-1/2″ IRWIN Tools Standard Drywall/Jab Saw (2014102) on sale for $3.99. Shipping is free w/ Prime or on $35+ orders.

About this product:

• 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