Yes, you can. I just looked on Aliexpress and they have replacement brushes, batteries, etc.
We've had the Dreame T30 for over a year now and we've used it a lot and we've been really happy with it so far. It cleans really well, which is something you can't say about all hoovers.
I think the Dreame is great value for money, but that's only if it lasts another few years. :D