Some things are easier to save on than others. If you have a paint store, Home depot or Lowes around shop for buckets that have been mixed wrong. That is usually the way I choose my colors.
2 days ago I bought 5 gallons of valspar paint that usually runs $108. for 30$. Color is kinda of white. But a $6 a gallon it did not matter. Every time I go to one of these stores I check for cheap paint. Not much color selection but for chicken coops and out buildings I don't think it matters so much.