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The OP was not talking about trade, he was asking price for selling to an individual. Unless i misread it.
Rule 1- never trade your car to CarMax
Rule 2- never trade you car, unless you can break even. Post it on CL and your time will come.
Rule 3- trade your car if the difference in the new one and your trade-in value saves you on sales tax. Sometimes the sales tax you save equals the amount you would receive selling outright. (Example: $60,000 for a new one - $40,000 for your trade-in means you only pay sales tax on $20,000... not $60,000.)
I agree with never trading to CarMax. They have always lowballed me.