I have no affiliation but I bought the hub, battery and controller from here https://www.aliexpress.com/store/1413140?spm=2114.10010108.0.0.AYXQ94 https://www.a

I have no affiliation but I bought the hub, battery and controller from here https://www.aliexpress.com/store/1413140?spm=2114.10010108.0.0.AYXQ94 https://www.aliexpress.com/store/1413140?spm=2114.10010108.0... (it a full kit but I didnt realise it doesn't include a PAS sensor so I have one on order). The bike cost 150 second hand and it fits together easily.