@Gup 

It depends on your local market. I've seen only the TL-WPA8631P on sale.

Check this sale for example - https://www.discomp.cz/tp-link-tl-wpa8631p-powerline-wi-fi-extender_d100485.html

  @Gup 

Q: Are all TP-Link Powerline adapters compatible with each other? Are TP-Link Powerline adapters compatible with adapters of other brands?

A: TP-Link Powerline adapters utilize HomePlug AV/AV2 Standards, which means all of our Powerline adapter models are compatible with each other and can be used within the same network. However, please bear in mind the overall Powerline rate will adopt the lowest HomePlug AV standard rate when using various TP-Link Powerline adapter models in the same network.

For adapters of other brands, if they adopt the same standard, they may be compatible with TP-Link adapters. However, please bear in mind that different brands’ products will have different methods to pair and configure the adapters. As a result, we suggest it might using Powerline adapters from the same brand to ensure convenience and compatibility.

A new Wpa8631p should be pared with your existing TL-PA8010P from your kit.

Q: How many Powerline adapters can be paired together?               

A: The amount can vary depending on the models used. For more detailed information, please refer to FAQ 434

Here's the full KB regarding PLCs.