Has anybody tried installing 3rd row seats for the 06 endeavor? if yes, where and how can ipurchase one? i have a 3 year old and i think he will fit in a 3rd row seat. many thanks.

there arent any, and it would be the most idiotic thing on the planet to try and engineer some. Unless you have the stuctures' blueprints, and know where to mount all needed hardware (including seatbelts), you're risking the lives of anyone you would dare place in them.

The next generation Endeavor will more than likely have 3rd row seating, but if you need it now then trade it in for an 07 Outlander XLS.