Some stores as low as $0.50 to $5.
Extreme YMMV but worth checking your local store.
In store pickup available. No shipping.
https://www.lowes.com/pd/IRWIN-7-Piece-Bi-metal-Non-Arbored-Hole-Saw-Set/1000237035
https://brickseek.com/lowes-inventory-checker?sku=1000237035