Impact Driver Bits (Screwdriver Bits) from $0.69 at Lowes (Free store pickup YMMV), many options from Craftsman, Dewalt, Bosch, Irwin

https://www.lowes.com/pl/Impact-d…eLowToHigh
Craftsman, Dewalt, Bosch, Irwin driver/screw/nut bits
43 options for under $1.
Many sets for under $5.
Nice set of 8 Bosch Phillips bits for $1.29:
https://www.lowes.com/pd/Bosch-Cu…1000318757
Amazon has also been offering select Bosch bits for under $1 with free shipping for Prime members. But the Amazon deals come and go.
https://www.lowes.com/pd/CRAFTSMA…1000594221