That is going to be a hard search at a dealership. I would look via private sale. The Highlander is generally a vehicle owned by people with young kids who spill things all over then discarded (traded) for something new.
I did a quick auction search of recent sales and found the average price on a 2007 base model was $12400 w/91K and for a 2007 limited $14700 w/83K nationwide. Higher if I limit it to our region. After recon&detailing dealerships will mark them up at least $2-3K depending on what the market will bear and banks will loan. That's just the business.
Speski OffRoad LTD, Cargo Solutions for Toyota 4x4's http://www.SpeskiOffRoad.com
"80 series, with a fridge"
1976 FJ40, Project with little progress.
2004 Starcraft 10RT