Lowes offers Kobalt Lockback 3/4" Folding Utility Knife 3-Pack for $17 (reg $20). Free shipping on orders over $35. 

Product Description:
For easy and efficient cutting, this Kobalt folding lock back knife is ideal. The aviation-grade aluminum handle ensures durability, so you can depend on it to last through all your cutting-centered tasks.

• Includes 3pc lock back utility knife with 3 blades
• Quick-change folding lock back knife is ideal for general-purpose cutting
• Aviation-grade aluminum handle ensures durability
• Quick-change mechanism provides easy blade replacements
• Cushioned grips allow for better comfort and control while working