I should have noticed your shipping to Japan, so yeah...that would make it a LOT less expensive than the US where I assumed it was shipping too. I live in Zhongshan China, and I do not deal with "middle brokers" like Alibaba, I locate and negotiate directly with factories only. There are some benefits to this, mostly its about quality control and of course competitive prices. The drawback can be that typically I must buy in sizable min orders.
My current squeegee company is located in a town called Foshan in the Shunde District, just north of me, maybe 30 minutes drive. My min order is 40 rolls per durometer. I will not get into my costs, but my wholesale clients typically pay under $20 a roll but usually buy in large quantities (100+ rolls). I offer tiered prices based on qty so I cannot give exact prices.
As for the shipping with DHL, its because Alibaba has made deals with them to become the preferred shipper and while EMS is cheaper (sometimes) the service sucks and tracking can often be all but impossible. I shipped 18 cases of products to Ohio (USA) last month air via DHL was actually cheaper...and it arrived in only 6 days!!