Only got one key

New owner of a used Charger and they didn't tell us there is only 1 key until we asked for the second one. Literally never bought even an old used car with only 1 key, this one is a 2023. They wanna charge $214 but there are key fobs on Amazon for like $20. Can we buy one of those and program it ourselves?

My brain won't let me pay $214 to replace a car key someone else lost but damn, only having one key is annoying. There has to be a better way.