Why would you use a In-Wall Relay over a normal in-wall switch?

The older Aeotec dualmicro has been discontinued in favor of their new nano line, but that line is more expensive.

The vision relay is still widely available and is probably the least expensive zwave model.

https://www.thesmartesthouse.com/products/zl-7432us-in-wall-switch-2-relay

Also, shop around. Amazon is often more expensive than some of the specialty retailers, particularly for items which Amazon does not stock it self, because the specialty retailers have to pay a commission to Amazon for every sale so the same item may be cheaper from their own site. Also you may be able to find some of the discontinued models still in stock.