powerline kits with additional slave units

HiAre powerline kits with additional (wifi) slave units still available . I cant seem to find them anymore Used to be able to buy additional slave units to put in additional rooms other floorseg like this , for some reason importer doesnt have these .https://www.tp-link.com/au/products/details/cat-18_TL-WPA4220.html

basically I need a powerline kit & will need 2 additional wifi powerline slaves for itI cant see a mesh unit working, if wifi cant get through the several walls I dont see how mesh would work there (?)