When can I buy a robot?

Excuse me, could you please clarify when exactly I might be able to purchase a robot? Is there a specific date or time frame that has been announced for their availability? Or perhaps it depends on the model and make? Additionally, are there any pre-order options or early bird discounts available for those eager to get their hands on one as soon as possible? It would be greatly appreciated if you could provide me with more information on this matter.