Anyone know a cheaper alternative to Dollar Tree Sure Scents now that there $1.50?

I use those for auto sprays around the house. I remember two years ago there were a buck, but now at that price, ehhh… Is there anything else out there cheaper than $1.50? Btw, I'm talking about the ones that you use in those automatic sprayers battery operated in rooms around you house, those timed automatic spray machines, 9 min, 18 min, 36 min, etc….. That last for a while…??