If you want a real US phone number (as increasingly banks are blocking VOIP numbers like Google Voice), you can get the lowest tier plan from providers like Tello or Ultra Pay Go. For $3-5/month, you get a US phone number, and ~100 texts (international) and ~100 voice minutes (international if you use Wifi calling).

You can pay for more data or voice minutes, but it's expensive and not a great deal.

eSIM is available.

But if you need a cheap US number, it can't be beat. Works great for people working overseas who need a 2FA US phone number or need to make occasional calls to US numbers (hi IRS!).