I would not hold someone to a sale if it was listed by mistake and the seller advises accordingly.
It doesnt seem to be the Aussie thing to do. Karma is Karma.
In any event, If the seller does honour it, Homepin is in need of this machine more than any because the identical machine he has would dearly love to accept some donor parts or at least a scan of the Translite. If i got it for $300 i would share in the good luck of it and re-offer it for the $300 to Mike (Homepin) who is a top bloke who would make absolute best use of this machine.
My thoughts anyway.