Sure. Kind of surprised that addresses weren't listed for the locations. I am pretty positive that it's the same location where Brandon signed for TGS as I believe Oak Brook only has one Borders.
The address is:
1500 16th Street, Suite D
Oak Brook, IL
Phone number: (630) 574-0800
Not sure where you are coming from, so hard to give directions, but if you just plug the address into Google maps or Mapquest, they will give you a route.
One last thing, with TGS, they (this Borders) had started giving out colored wristbands earlier in the day (when they opened) to signify what group you were part of when standing in line. Like the first group was orange, I believe (which is what I had). And they stood in line first, then I think it was red.
I believe there were only two groups, as each group was pretty big. Where I don't think there was a cut off on Brandon signing books, I couldn't say 100% for certain as my friend and I did not stay until everyone was signed. So you may want to get there earlier in the day to get a wristband for yourself (or also whomever is coming with you). But, you may of course want to call the story to confirm if they are doing this again or whatever system they may be doing. I know I will be.
Oh! Sorry, one last thing.
I would recommend getting to the store at least an hour early if you want decent seats. There were quite a few people who had to stand that came in at the end.