Many of the large home improvement stores like Lowes and Home Depot sell “mis-tinted” paint for cheap. You may have seen some of the 1 gallon buckets of pink or turquoise for sale in the paint section. I guess those colors sounded like a good idea to someone at some point, but then they returned them to the store.
What you may not know is the stores also sell the 5-gallon buckets of mis-tinted paint. They’re sometimes stored behind the counter… you’ll need to ask for them. I recently bought a 5-gallon bucket of interior paint for only $25. It was originally tinted “dove white”, and the store was able to re-tint it to the color I wanted for free.
I now have enough paint for my great room and hallways; all for only $25!