I had the same problem with the serial number not getting accepted, before I even entered shipping address or anything. Then when I tried again, it said:

Nintendo said:
Wii Remote Jacket Accessory Offer

Our records indicate that your request for additional Wii Remote Jacket(s) has exceeded the maximum quantity allowed per Wii serial number.

If you feel that you have received this message in error, please wait 24 hours and try your request again.

If you've already waited 24 hours and are still receiving this message, please contact Nintendo's Consumer Service Department at replorders@noa.nintendo.com or at 1-866-431-8367. Representatives are available from 6:00 am to 7:00 pm, Pacific Time, seven days a week.

Click here to go to the Consumer Service home page, or
Click here to go to Nintendo's home page.

I just called the number on the website, 1-866-431-8367. They told me it's a problem on their end and they're working to fix it. He said to wait a few days and try again, and if it doesn't work, to give a call back.

Sounds like their site is getting hammered.

Nintendo site's getting hammered right now. FW effect!!!

Man, was my CSR the only one who didn't process the order right then? Lame.

Thanks OP!!!

OO Nice! Cant wait to get home and get this!

juser said:mrredskin said:that's a pretty cool thing of them to do. even tho the things probably cost 5 cents to make, it's good to know they still appreciate all their customers.

Perhaps, but I am willing to bet thousands of dollars were spent with designers, lawyers and the marketing department. I am very glad they are providing a free enhancement, but someone's bottom line was impacted and they did it for a reason.

October 2, 2007 - Nintendo is taking quite the financial hit to make sure players don't drop their Wiimotes. Those free covers that we reported on earlier today are expected to cost the company over two billion yen (about $18 million), according to the online version of Japan's Asahi newspaper.

Linky

Thanks OP. Just ordered 4 without a hitch.

Nintendo has been pretty good about spreading the love amongst its Wii customers. This also will give them an idea of how many machines are in the wild; nothing brings registrations in like giving away free stuff.

Got my 4! Thanks OP!

I got the error message on the site and couldn't order from there. So I just ordered over the phone. If the site is really getting hammered, not many people are calling. I was on hold for all of maybe 2 seconds before I got a live person.

for those with success calling, what number did you call?
nvm....called and they set the order up. Nice guy!