There's a lot of technology available these days for recording calls that does not require you to purchase a physical product. If you have a smartphone, check out the available apps and you will probably find voice call recorders in there.
There are also call-through numbers that will record a call and email you an MP3. Those allow you to call from landline phones.
Please be sure to check the rules regarding one-party consent states before recording any calls, however. That can be illegal in some circumstances.