Just be aware that most of the Hakko tips on ebay are fake. Having said that, I have ordered some from ebay knowing they are fake, but for the little soldering I do, they seem to work okay. I did get one that was totally pitted inside the package. A quick photo and email to seller resulted in another one being sent.
A real Hakko tip from my local electronics store is around $13 + tax CDN vs $2 + free shipping CDN on ebay. Aliexpress may even be cheaper than ebay?
If I did a lot of soldering, I would probably get a real Hakko tip from a reputable seller.