This one on Amazon looks nice, it uses the OEM charger though
https://www.amazon.com/gp/aw/d/B01M4RP0X1/ref=mp_s_a_1_3?ie=UTF8&qid=1513220801&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=zenwatch+3+charging+dock&dpPl=1&dpID=31Hdx92DX-L&ref=plSrch