I was questing through the story, and as I was going through the Lanzelt Highlands, lo and behold, I come upon a Hill Gigas in the 3rd level (plateau)of the area! Makes sense I guess, considering the creature's name. I also found one in the 4th area (caves), and the map also has an exploration if you want to try grinding that. Happy Hill Gigas hunting!

...dang it, I should have taken a screenshot...

EDIT: I'd also flair this post, but I still can't get the save button for the flair choice on the screen...on a laptop, google chrome, and the save button is always off screen if I have any kind of flair selected. Can't click the save button unless I'm removing the flair as a result. Fixing the flair selections in place like with the user flairs would help a ton.

EDIT 2: Alright, so the zoom trick fixed the problem with not being to be able to see the save button for post flairs. Slightly annoying, but oh well. Solved my issue. Carry on.

EDIT 3: Flairing problem solved.