There isn't a good chip solution right now for the T802 cartridges that the WF-4734 takes. There was a resetable chip available very early on, but that was patched out very quickly. Then there were single-use chips available, but I am having a hard time sourcing them even from China. If you have updated the firmware on this printer within the last year those chips likely wouldn't work for you anyway.
There is a chipless firmware available, though. I would recommend that route and then you can get chip-free cartridges from China.