Amazon has the 4-Pack Makita B-34936 Impact GOLD #1 Phillips Insert Bit on sale for $2.99. Shipping is free w/ Amazon Prime or on $25+
Product Description from Store
- Designed exclusively for high-torque impact drivers
- Extreme torsion Technology is engineered to allow the torsion section of the bit to flex under load, taking pressure off of the bit tip for increased durability in high torque applications
- Precision-fit tip engineered to prevent "cam-out" And stripping
- High-quality steel engineered for use with impact drivers
- Combine with an impact Gold bit holder to last up to 15x longer than standard insert bits