Paint: questioning a cheap endeavor

Commercials for bear, sherman williams, etc show up around and everyone sees them eventually. Has anyone actually found a cheap paint that covers well and looks nice (water based for indoor) that is cheap and worth the idea of experimenting or doing a room that you know you will have to repaint white later before you move out. Been here 4 years, no real plans of leaving, fuck I put a chicken coop out back a near 2 years ago.. but I know a day will come when they say "hey your rent is going up drastically or you can't have pets or something"

Sadly they switched from year leases to month to month 3 years ago (after the first year) but I figure at some point maybe it is worth just painting something to make it more homeish than damnit I'm still here