I have two legacy unlimited Verizon lines (no throttling but they kick you off permanently if you go over 200GB/month/line). It's more like $100 for the plan (I think this can be slightly cheaper) + another $65 each for the two lines.
If anyone is willing to pay a reasonable fee for transfer of liability I am looking to switch to Google Fi with two lines for about $35/month + pay-as-you-use data.
On eBay there are all kids of "unlimited data" hotspots for $50 to start + $100/month; I don't know how these people can afford to do it. (Also ones for $5/month somehow but that's even harder to understand.)