Yea im getting Panicky too. After finding out that there were actual line ups for preorders close to my house. Man i thought that there wouldn't be any :S , But i live in Canada, So im going to compose a list for you where you can search for your wii. Yea if you go to all these stores on launch i doubt you will be able NOT to find one.
-Walmart - Getting Alot
-EBgames - Sold out fast
-Gamestop[US] - Sold out fast
-Bestbuy - Getting Lots
-Futur shop - Owned by Bestbuy[Same Company] - Getting alot i think
-Toys R Us - Getting the MOST
-Target - Getting lots but depends on location
Also check the preoder section of the forum.
Some of these are only in the US...