I found an IPhone 6 sale at Target ending Saturday, but my contract won't end for another 2 weeks, and I can't afford the phone at the Verizon price after the contract ends.
You'll pay the minimum ETF - one month's worth. If the EFT is $250, each month spent in contract takes $10 off your ETF so 23 months = $230 off the $250 ETF. If your ETF is higher than $250, just subtract the $230 from whatever it is and you have your final payment (plus the regular monthly charges).
You cannot pay the early term fee early to get the discounted price. Unless Target is willing to let you upgrade early you are out of luck. You wouldn't even be able to cancel the line and start a new one. That's considered false churn.
Agree, you can't do what you want to do.