I am a little confused about the reports of late Wii Fit shipments throughout North America when the package, as far as retailers are concerned, hasn't even gone on sale yet. While Nintendo did see fit (pardon the pun) to release their balance board on the 19th, I've seen boxes of the product at several retailers with giant "Do Not Sell Until May 21st" stickers on them. The shipments aren't late...they're dated.
I actually held one in my hands at a local Walmart nearly two weeks ago, with the ever-friendly electronics clerk (one of the few at a Walmart who knows what he is on about) even offered to sell it to me early, if the computer let him. Sadly it did not, once again flashing the message warning not to sell the game until the 21st. If Nintendo changed up the release date on retailers they didn't do it in enough time to change the box stickers and POS system fail-safes.
Don't even bother looking for one today. As far as the retail world is concerned you can get your Wii Fit on tomorrow. We've been lazy this long, another day won't kill us.