Sense won't stick to wood sash

I’m not saying they are assuming everyone has this on hand. But more that since it’s readily available and so much of a commodity that there’s probably no profit in it for them, especially when you consider what they’d have to charge for shipping. But who knows, maybe they’ll decide to sell it.

The statement was effectively that something to stick it up is a common commodity.
A 4 pack of small command strips from Walmart costs about half of the projected cost of the entire motion sensor.
I prefer to use Velcro.
So I would prefer not to pay for 3m tape.