Many of the smart plugs provide power monitoring features. A few that I have are:
The Zooz Double Plug that provides 2 120V connections:
A Zooz power strip with five 120V connections that can be individually monitored and you can also monitor the entire strip:
The Zen15 which is rated for up to 15 amp items:
I have several of the Zen 15 on heaters and other larger appliances.
But the best deal is on the Iris 3210-L plugs (used) from ebay:
https://www.ebay.com/itm/Lot-of-5-Z-Wave-Plus-Smart-Plug-Model-3210-L-White-Zigbee/153454971494
The driver from @srwhite is what I'd use with the Iris plugs:
https://www.ebay.com/itm/Lot-of-5-Z-Wave-Plus-Smart-Plug-Model-3210-L-White-Zigbee/
