Obviously you're an experienced pro, so not much to add.
That day/night flagging tape is a real find for me. (disaster medical team safety officer)
Called my surveyor. You will never believe where he found it originally . . . Lowe's Home Improvement in the same area with chalk lines, marking flags and other marking tape. Here I have been "procuring" it from him, he buys it at Lowe's and I am in there at least three times a week and walk right past it.
At my store it is near the contractor checkout on an end cap to the tool isle.