you can sell anything to blake, providing he has sufficient funds. However on getting the invitation to the castle an imp approaches you and steals both transporter pryamids, so may scheme is over.
Still i've got loads of money now, and have a feeling that you will get the transporter pyamids back once you have completed the quest which involves escaping from the castle. Obviously if you still had the teleporters for this quest it would be to easy, and thus a pointless quest
