Allan, I have a Lietner Electric Mountain Bike, got it two years ago. Full suspension. I don't think they sell my model anymore, but here is a link to their website.
https://leitner.com.au/?gclid=EAIaIQ...SAAEgKmt_D_BwE
There are plenty of Ebike sellers online, but they can get expensive. Conversion kits are available for DIY. Rear hub motor conversions might be the easiest, but I have seen front drive versions as well. Ideally, the best of these electric bikes are crank mounted motor models, Bosch makes crank motors ( which usually means you don't have to scrap your existing wheel, like you would in a hub mount.
Anyway do lots of research, and stay with the legislation regarding ebike power, speed, etc. There are some sold which are illegal, and frankly dangerous. If you are going to use it on the road, bike paths, etc, it must comply with the regs. Off-road only have few restrictions.