I used to pickup sq drive general purpose screws at Home Depot. The brand was Western States. A 5# box was under $20 I think for 1-1/4 and 1-5/8. They also have 2", 2-1/2, 3" in the 1# box.
We moved, and neither my local HD nor Lowes seem to carry them. All they have are phillips drive except for coated deck screws.
Is square drive sort of falling by the wayside? Any recommendations for a general purpose woodscrew?