これオススメ　色もmini2018と同色
512GBで約34000円
https://www.amazon.com/Certified-TEKQ-Rapide-External-Thunderbolt/dp/B07GZGT37C/ref=sr_1_3?ie=UTF8&;qid=1545963716&sr=8-3&keywords=Thunderbolt3+SSD