How much is a duplicate key with electronic security chip for a ford f150?

No

The easiest way to get around the Transponder Chip in your 99 Ford Ranger is to have a chip programmed and mount it under the steering column cowling close to the inductor coil on the ignition lock....

Yes every F-150 since 1999 has a transponder "chip" in the key. You can get replacements or extras from a locksmith or your local dealer.

yes

without it the security lite will start blinking fast and the motor will only spin over but not crank