There are places which can simply skim the disc, and hopefully it will work again, obviously for a small payment. There are other devices which can also fix games, but it depends what kind of damage has happened. Hope this helps!! ☺
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Check your disks, make sure they arent damaged, if they are not damaged send your xbox in for repairs
Send it off to Microsoft for repair.
Bring it to your local game store and ask if they fix scratched disks.
If it only does that for a certain disc, then the disc is probably damaged and needs to be replaced. If this happens for all discs, then there is a problem with your disc reader. If that is the case, contact Nintendo and see if they can fix your wii.
At least Between 10 to 15 Dollar In GameStop.