I went and test rode an E-Bike recently.
It was a lot of money ($5K here), and really heavy (25kg+).
Since I already have an 11kg MTB I'd probably only add around 5kg with a DIY conversion and it would cost a fraction of an off the shelf bike.
Depending on exact specs, (for most of the world 250W is the legal power limit) you'll spend about $1000 on a quality conversion, but unlike an off the shelf model, you won't be stuck with anything proprietary that you can't later fix or upgrade yourself.
You can also start with a bike you already have or a cheapy you've picked up that needs work.
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