Nintendo Wii, another popular video game console from Nintendo is in high demand and has become very famous not because of it cheap price but because of it fantastic graphics also.
Because of it popularity sometime you will see empty shelves of shopkeepers and sometime long ques to buy Wii game console.
The best way which i can suggest is to become a member of a gaming site because they keep on giving special offers for downloads.
Many companies are there which take one time registration Membership fee which is for life time and you will be always updated with latest game releases and latest movie releases.
Just make sure that the company must be having  24/7 technical support which i personally think it is must.
You can find out  several websites with ways to download unlimited old and new games for a Wii. Just check on google search box for  most frequent results.
I hope you understand i tried to solve your problem on my past experience join a good site and have lot of fun with Wii.