@lpboldrini 

From my point of view, a charging dock isn’t a wearable or consumable accessory like many others, so it’s less likely to be sold as a standalone item compared to other parts. That said, availability could change down the road, since we have stocked it for other models like the ones you mentioned.

For your situation, i recommend reaching out to your local TP-Link support directly to see if they can provide any assistance. Contact Technical Support