Cheapest way to call a US phone number?

I need to make a one time call to a business back in the US and need to call their phone number. This will more than likely be a one time call, so would prefer not to have to set up an account with anything.

I think I used to use Skype back in the day, and buy credits but no longer have a Skype account. I thought their used to be a LINE out or LINE call but can’t find it anywhere in LINe. Also my carrier doesn’t support wifi-if dialing.

So was wondering if there was any easy/cheap way to make a call to a US number without having to set up a bunch of stuff.

Thanks