Just mod the thing and use a harddrive.
I had the drive die on mine a year or two ago. I bought a replacement, installed it, and only got the gamecube games to work even though I was very careful to order the proper replacement. Upon contacting the company their response was "oh you have to take it to a repair man and have him crack the drive" which is complete b.s. (no such procedure exists or is necessary for a wii) and totally defeats the purpose of repairing it myself.
You can buy replacments, but for me the hassle of opening up my wii (which is a pain in the butt because everything is so tiny) only to discover that the drive still isn't going to be fixed turned me off from the idea, especially considering I knew the Wii U was just around the corner.
Honestly it might be a good excuse to upgrade to a Wii U. All of those games will still work. Though to be perfectly honest you must have just gotten the thing to still have games worth buying for it. There hasn't been a good game released in over a year.