Mazda6 with throttle problems

My wife's 2003 Mazda6 has 120k miles on it. She told me that while she was driving down the interstate it lost power slowing the car down pretty fast. She pulled to the side, cut it off, and then restarted it without any problem. She also said it feels like the car tries to keep going when she is stopping sometimes.
It has a cel on so I checked that and it read a bad throttle position sensor. (P2135 TP sensor No.1/No.2 voltage correlation ON 1 CCM)
99.9% of the time the car runs fine. I checked with mazda and the sensor is only sold with the whole throttle body, which pushes the fix out of budget, especially when it's only a maybe. Is there anything else this could be or does it sound like it is a TPS?
Thanks,
Dan