There are many things you are having trouble with. I can say that almost any cheap wii to hdmi adapter works well enough to connect to your monitor though you can spend a little more for a better quality and a reliable product. Super cheap ones can be had for like $5 from websites like aliexpress or wish but I can’t speak for their quality as I’ve never tried them.
#wiimmfi installation
high willow
Sorry to hear that you couldn’t find a product. I think that most places will not have them in person except maybe retro video game shops. You might find one on Amazon or similar to help troubleshoot what else is wrong with your wii