Mine is a motion-detecting striplight that switches off after 30 seconds of no motion.
I put it across a shelf in my bedroom facing the bed. I switches on when I enter and stays on whilst I undress and wash, then switches off 30 secs after I get into bed.
If I get up in the night to use the loo it switches on so I can see my way out to the landing, is off whilst I am absent then switches on when I return.
Any time I am in bed in the dark I can raise my hand high and it will switch on for 30 seconds.
It's made my life far easier as I don't have space for a bedside light.
Love to hear your best bargain gadget that costs less than £10.