I got lucky and got in on a 25$ a month for life guarantee with T-Mobile home internet. It was cheap so I tried it on a whim along side my spectrum and it ended up being faster that the 80$ a month spectrum. I’m very rural so there’s little congestion but I suggest trying it out especially if you already have them as a mobile carrier.

Depending on where you are, look for Fidium, Go-Net Speed, TDS, Verizon Home Internet, RedZone Wireless.