Home brew paint job.
5$ if you use a rattle can.

edit: less than 150$ if you want to paint the whole truck
http://www.thirdgen.org/techboard/bo...paint-job.html

 

honestly if you dont want the panel a different shade than the truck its best to respray the whole truck if it hasnt been painted in the past couple of years because of the oxidation on the clear coat, but, if you dont care you can do like sheriff said buy some paint and have at it