work for you?
6-Lead Personal EKG (ECG) AliveCor KardiaMobile $129 at Amazon
Note that unless you know you have heart issues, 6-Lead is not going to be more helpful than 1-Lead, Kardia's software doesn't analyze the extra leads, you have to have a doctor who can read/understand it.
They nag you to buy premium services but you never have to, it works forever for free, you can use the Kardia app or the Omron app.
Looks like Amazon is giving it extended return through January 31 2022