I looked up my local Toys R Us and they stayed open till 12:00. Signage says they'll sell the Wii Nov. 18th at 8:00 AM, but I asked if they could sell me one at 12:00. She called another store and they had a guy waiting there so they decided to let me see if it would process my transaction at 12:01. Store closed at 12, transaction processed at 12:01. Left my house at 11:45 and back home by 12:10.
Definitely YMMV but worth throwing out for all the Mountain and Pacific time zone Wii hunters.