In my area I'm seeing a few random ones on roadways, but mostly clusters of them in the parking lots of Home Depots, Lowes, and Wal-Marts.

Same here, but just Lowes stores. That I know of. I surveiled the two local Lowes roughly a month ago and found two cameras not mapped, which I gleefully added myself. Want to send them a snail mail complaint at some point stating they won't be getting my business until they step back from turning us into a police state.

I contacted them about it too and got the most generic corpo pr about them being essential for the safety of their employees.

Are they Flock cameras or bog standard CCTV?

The Lowes cameras are definitely Flock. The look is unmistakable. See

https://deflock.org/identify