BiggiePMost of the aliexpress listings for the Pro 80 at or around that price omit the aluminum case, which is included in this drop, and only have the cloth storage bag. I personally would get it for cheaper with just the cloth bag, but I can understand if people would want the case (it's great, and fits headphones like the Beyerdynamic DT line, etc), and the lowest drop price seems pretty reasonable.
May also be worth noting that the Gemini HSR-1000, a Pro80 re-brand, sells for $43 shipped on ebay, $45 on amazon. These also do not include an aluminum case though, just a velour storage bag.