While I don't think a USB controller would work for the Wii, perhaps these would work? They are half the price of the Hori Battle Pads (including that they are a two-pack), and will plug into your GC port.

These are the ones I use. I have mainly used them on a Switch with the USB adapter, and they work fine. They’re a little stiff, which I like, but they’re still pretty new. Because of the stiffness, they are a little “clicky” sounding when in use (as an older gamer I didn’t even notice, but my GF pointed it out when her 7 YO and I were playing Smash Bros), so take that into consideration as well.

Gamecube Controller, CIPON Wired... https://www.amazon.com/dp/B07BS5TXBF?ref=ppx_pop_mob_ap_share

I saw a video and was looking into this one instead.

https://www.amazon.com/Hyperkin-Controller-Adapter-GameCube-nintendo-u/dp/B013XAVPFW/ref=sr_1_3?crid=7LC5U00EQ8XV&keywords=Hyperkin+4-Port+Controller+Adapter+for+GameCube&qid=1682208559&sprefix=hyperkin+4-port+controller+adapter+for+gamecube%2Caps%2C107&sr=8-3

IMO, the price for the official is too much, and I was looking into getting these controllers.

https://www.amazon.com/Gamecube-Controller-Controllers-Nintendo-Compatible/dp/B07BS5TXBF/ref=sr\_1\_4?crid=2UFM3GENJAGJG&keywords=gamecube%2Bcontroller&qid=1682208401&sprefix=%2Caps%2C210&sr=8-4&th=1

Thanks.

https://www.amazon.com/gp/product/B07BS5TXBF/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 I got these 2 months ago and they work great. 2 for 20 dollars.

Source: https://www.amazon.com/Gamecube-Controller-Controllers-Nintendo-Compatible/dp/B07BS5TXBF/ref=sr_1_15?keywords=nintendo+switch+gamecube+controller&qid=1568348999&s=videogames&sr=1-15

I'm pretty sure I bought these. Would not recommend lol

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https://www.amazon.com/Gamecube-Controller-Controllers-Nintendo-Compatible/dp/B07BS5TXBF/ref=sr_1_3?keywords=gamecube+controller&qid=1573592937&sr=8-3

My Wii has GameCube controller ports, and I use the controllers that I linked below. They’re a little “clicky”, and stiff, but they do the job and I didn’t notice any input lag.

I have used the adapter linked below that to use the same controllers on a Switch. This set-up will also work on a Wii U.

The link below that is in case you need cable extensions. I did.

Gamecube Controller, CIPON Wired... https://www.amazon.com/dp/B07BS5TXBF?ref=ppx_pop_mob_ap_share

Switch Gamecube Controller... https://www.amazon.com/dp/B07NVQNFGK?ref=ppx_pop_mob_ap_share

Coolayoung Pack of 2 Controller... https://www.amazon.com/dp/B07Q765LP4?ref=ppx_pop_mob_ap_share