I have a mesh with deco m5 stations and would like to extend this. deco m5 is not for sale at deco. Some shops have it but at very high prices. which new tp-link station can I combine with my current

I Am experiencing reduced download speeds. My internet connection is 500mb up and down which is also what the deco app internet Speedtest gives. But if I test my iPhone I get around 250MB and with my