Have you tried ordering some fuckin punctuation, mate?

Every sort of microcontroller/breakout board imaginable. I'm fond of the nanoCH32V305 (144MHz RISC-V CPU, 32k RAM/128k flash, and GPIOs for days)

Soldering project kits. I bought a NTP capable clock kit to learn SMD techniques, then discovered that the Chinese market has no need for time zone support, but I had little need for the time in Beijing.

There's a surprising amount of miniature stuff there-- terrain parts for model railways, or dioramas or wargaming. The actual model railway stuff seems sort of thin on the ground, mostly resold and expensive foreign brands or toy grade stuff.

I got one of those ominous looking wire-stripper-cutter-tools and rather like it.

Not electronic, but engagement/wedding rings. We got titanium and tungsten carbide rings for both of us for less than $10. Your values may be different, for us it’s not about spending six months salary on a ring, it’s about having matching jewellery to show others we’re joined.

Electronics, any kind of computer cables, switches, kvm, router, hub, mouse-wiggler etc.

Soldering station, air filters, belts, phone chargers, usb cables. NEMA stepper motors.

Bike lights. 18650 Batteries. Drones. NFC tags. Light table. Sun glasses.

IR Thermometer, blood oxygen tester.

I even bought socks there, quite ok and dirt cheap!

Reading glasses.

I'd avoid :

Fountain pens (they're "ok" but not Lamy Safari quality), wrist watches suck badly. Small scissors.

I buy so much on AliExpress 😅

I got some nice keycaps when I was building my first mechanical keyboard. Aside from that... Soldering gear, 3D printer parts... Cat toys, preflashed smart bulbs (so I can use them completely locally with home assistant), magnets.. And generally any time I see something on Amazon that clearly is just rebranded Chinese stuff, and I don't need it quickly, I can find it on there for a fraction of the price.

Tons of good mechanical keyboard stuff on AE. Not the absolute top of the line customs boards or keycaps, but almost everything else is hiding in there somewhere.

If you 3D print, heat inserts. You can use them to insert metal threads into a printed object with a soldering iron to allow you to use standard machine screws in projects.

Cheap disposable tools that you need for some project that you only need a couple times a year (if that).

All kinds of small electronics and components, thermal putty, thermal tapes, heatsinks, antennas, plastic cases, replacement customized cases for specific electronics (handheld consoles, etc.)

Pc atx 24 pin breakout board

Cheap esc for bldc ( but those yellow extra cheap ones have a tendency to burn up on high duty cycle loads )

Cheap bldc too, I use one plus a 3d printed fan + shroud to cool nvidia tesla gpus and another two to vent in/out garage door windows in summer

So many sensors

E ink screens plus esp32 or other mcu / sbc

Small touchscreens plus sbc for diy smart stuff

Cheap aluminum extrusion and fixings ( ryobi scroll saw is a relatively quiet and controlled way to deal with smaller stuff like 2020)

Cheap bms and mppt solar bois

Cheap rgb led stuff, I'm partial to the water proof silicone stuff, easy to pair with an esp32

A lot of tat is similarly priced on Amazon and the likes. Always worth a double check before defaulting to ali

Retro handheld gaming machines! One like the Miyoo mini - https://www.aliexpress.us/item/3256805029072733.html?spm=a2g0n.productlist.0.0.70ea1175JsQ6Yu&browser_id=d65e366aa49c4fc8b9e50714328659c1&aff_platform=msite&m_page_id=deaacfcbec18c234cca5c250c07efc932199ddaea1&gclid=&pdp_npi=4%40dis%21USD%2166.22%2166.22%21%21%21470.00%21%21%40210321c717013992842986230e162a%2112000032398395660%21sea%21US%210%21AB&algo_pvid=d938bf3e-547c-424a-9458-27ead5dd64ba

Incredible handheld gaming device.

Decent selection of low brow lingerie for the price.

I recently bought a Pinecil soldering iron from AliExpress, which is one of the main official ways of getting them. Very nice product.

Diamond sharpening stones. Still waiting on mine but they were cheap and I got the grits I wanted. Somehow I keep ending up putting new edges on knives, chisels, and other blades. I hear diamond stones remove material faster.

Probably the best thing I got there was clone of RSP1 with selectable band pass filters for €20. 10kHz - 2GHz range with up to 10MHz of bandwidth in Zero IF mode, although it seems it's more like 8MHz that's actually usable. It's not sold where I bought it anymore, but maybe you could still find it.
It's this one:

The only problem is compatibility, and the fact that I had to install some proprietary API from SDRPlay on my laptop as a SystemD service.

You can find really good wired earbuds. One of my favorites were made by Yincrow $15-$22

Ridiculous pillows/stuffed animals.