In the box with all the original packaging, shipping plastic and paperwork?
Someone's gonna take what I say for a price and run with it (and to all future people reading this post, I'm sorry...) but I dare say it starts at $2000cad, with the two critical points being it's essentially NOS and it's
working. I've never seen a PET this old that "
It Just Works." MOS's chips age horribly.
As of this post it seems the going ebay price (note we are factoring in that ebay is a lot more visible than say, the vcfed marketplace and thus there's more people roaming around with deeper pockets willing to blow it on the first system they see will skew the results so OP, don't think you're about to win a lottery) is $800usd for a chiclet PET that is as-is, $900-$1500 for a chiclet that is clean
and working at the time of sale.
Non-chiclet PET's seem to go for substantially less. Between $350 and $850usd, depending on condition and again, if it's working at the time of sale.
You can make a dead PET work with aftermarket parts, but either you are gonna spend a ton on aftermarket chip substitutes and adapters or a substantial sum sourcing exact replacements like the folks building up Apple I replicas. Comes down to if you prefer a working machine over originality. (or if you want to use a keyboard that you won't hate after a few days

)
On that note, I'd like to thank Space Lab in Vancouver for selling me my machine for such a pleasant price. Some people are not looking for an easy paycheck.
The big variable however is this is all in Alaska. It's amazing how someone can empty their wallet for something, then be total cheapskates when it comes to paying for shipping. For reference several times a year for $JOB I'm shipping cartons about the size of a boxed PET and weighing around 53lbs to Whitehorse via courier and that's nearly $400cad one-way.