People have been tossing around a lot of rumors as to why they are not making more Nintendo Wiis for retail. Well the reason is like most companies, the numbers the company uses for books and sales is based on a fiscal year rather then calendar year. Most companies end there year around tax time April 15. As schools end their year end of June, because that’s when grade school ends. Supposedly Nintendo had sold way above the predicted amount of Wiis and was waiting for the fiscal year to be over before they started selling more Wiis again. I bet you will see a lot more Wiis and Wii accessories out in stores for sale.
Source i heard this from was an American distributor of Nintendo. Just another rumor but working as an accountant it seemed to make sense.