I know. And quality is sometimes quite impressive for the price.
But when things are too cheap, check the shipping price.
What I like to do is enable the "choice" sellers in the left bar. This shows you only the sellers that ship through Aliexpress Bundle shipping. What's fun with this is that you can buy from multiple sellers and all the products get bundled together for the shipping. This is the faster way to get the stuff.
Also, when you reach a certain amount in the cart, you get free shipping. Here, it's 10$ CAD; so I just add things until I reach the level.
Things that are of good quality:
Hoya filters from here (
https://www.aliexpress.com/store/911932365)
Soft release shutter buttons
Filter adapters (step up/down rings)
Reverse lens adapters (for homebrew lenses)
Lens caps (front and real)
Body caps
Exposure meters (the on-camera ones)
Lens adapters (M42 to Nikon, LTM to M43, etc.)
Camera repair tools (like spanner wrenches)
Camera neck straps
Sewing supplies
Computer peripherals (mostly OK, except SSD's and SD cards)
Brother P-Touch tape
Stationery (except pens)
Artist supplies (paint brushes and spatulas)
These are pretty much what I've had good experience with so far.