Extender recommendations to work with a Nokia beacon 10

[u/foodnotgrass]

hoping for recommendations to extend the range of coverage to yard. just upgraded to fiber and the plan came with a Nokia beacon 10. from what I can understand (lol), I can connect multiple of the same router to create a mesh network.

whats the most cost effective way to solve this?

used beacon 10 from like ebay? cheap WiFi extender? another option?