DNA testing

[sailortats]

I know quite a bit about my mothers side of my family, my scots relatives. I also know quite a bit about my paternal grandmothers family, my English relatives. But I know nothing about my paternal grandfathers family.
Where does one go to get the DNA testing that is talked about from time to time in these threads?

[Oldhiker]

here is the oldest and largest company doing genealogy DNA testing
http://www.familytreedna.com/
look for a project with your surname so you can get a discount