https://www.bodyshopbusiness.com/automotive-refinish-formula-profitability/ Here's a ball park account of the percent costs for body shop. Paint is less than 10% of cost and that includes mark-up. So not saving much buying "cheaper" paint, but may save time, etc. EPA/OSHA has stepped in on VOCs, etc. and some OEM things are verboten.
Changing color "properly" is more work than just re-painting same.
I wouldn't look to change the color, unless the paint/etc. is shot anyway and need of restore. I'd look for another car with a color I could live with. They're always cheaper completely done. The other factor is once you get under the paint, you never know what you'll find, collision damage, could be a bondo queen or burgeoning rust bucket requiring lots of metal work. Not to mention pre-war and the "orange crate" work.
I can still do my own paint/body work, but unfortunately can not bank the cost savings. Most people will ask for receipts, proof, etc. if you say it has a $30+K paint job.
You can get a good paint job at some of the chain places, but check their work/guarantee before you commit. The one down the road may be better. Ie; are they liable for runs, orange peel, overspray, adhesion, etc. I wouldn't worry about saving a "few bucks" on paint, as the paint is the eye appeal and makes it stand out. They're not books, people judge them by their covers.
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