I LOVE those commercials (BTW Kaiser-Permanente also has a weight loss maintenance email newsletter available FREE to all -whether you're a KP member or not).
There are lots of motivational recordings out there - you just need to find something that works for you
I would suggest checking out your local library first before spending money on one that you may or may not find 'motivational'. (I'm a music person - nothing motivates me more in the gym than some really great R&B or Motown at this point!).