Amazon has 2-Pack 4.5" Spyder High-speed Steel Jigsaw Blades for $3.91. Shipping is free w/ Prime or on $35+.
Product Description from Amazon
- Spyder 4.5-Inch double sided jig saw blade designed for wood
- No other jig saw blade will allow you to cut extreme radiuses so easily or as clean as the Spyder patented double sided jig saw blades will
- This blade is designed for hardwoods softwoods and all wood based products
- This package contains two 4.5-Inch double sided jig saw blades made from durable hardened steel
- Double sided Jig saw blades with a small cut radius for extreme curves Made in Germany