Where can I buy a pet stoat?

Why not get a legal ferret instead? They look very much like stoats and are in the stoat family, along with weasels and otters.

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YOU CAN NOT SO DONT LOOK

They are illegal to own in the U.S. and Canada, so you can't just go to PetSmart and buy one. With some detective work, you might be able to find someone who has one they will sell you, but you'll have to be very careful not to get caught.

Possibly you could go on line and find a breeder or you could put out your info  to different rescues your looking to have one as a pet.

Chances are you would need to live in a totally pet free environment or the other pets may suffer.  Stoats are very very high energy and they make ferrets look calm and quite.  Stoats are always running, jumping, paying and active.  They have a tendency to bite especially when playing and they need to be trained to curb their play bite.