If you are willing to navigate Taobao, there are quite a number of MSI 3060 Aero ITX from reputable stores, where I got mine at around market price.
Also, I have made a complication of all the ITX cards in the RTX 3000 & Radeon 6000 series for my own reference, but happy to share it! Hopefully I didn't miss out any.
MSI 3060ti & 3060 Aero ITX
- Dimensions: 172x125x43mm
- Fan blade rises a few mm during high RPMs and might (will) impact case compatibility (Source: I have a 3060 Aero ITX).
- 3060ti seems to exist only on the website.
- Aero ITX design hasn't changed in a couple of generations, and it looks neutral enough.
Asus 3060 Phoenix
Colourful iGame 3060 Mini
- Dimensions: 177x128x51mm
- 2.5 slots, which is a shame, as a lot of small sandwich cases can usually only take 2 slots.
- Asus's Phoenix design hasn't changed in a couple of generations, and it looks neutral enough.
Palit 3060 Storm X
- Dimensions: 182x130x42mm
- Best looking of all ITX cards so far, but at 182mm long, it will have fitment issues in some cases, with a backplate, white and silver aesthetics.
- Edit: Has a Red LED Strip on the top of the GPU, where the RTX wordings are. Unsure if it is ARGB or just red.
- Colourful primarily targets the Asia market, so availability would be even worse if you aren't based there.
- Edit: Just released for sale, but users are complaining of fan noise, possibly due to a faulty fan? (Thanks to @tinyitx for pointing this out!)
PNY 3060 XLR8 Gaming Single Fan
- Dimensions: 170x125x39mm,
- No backplate, neutral aesthetics and has RGB.
Gainward 3060 Pegasus
- Dimensions: 170x125x40mm
- No backplate, neutral aesthetics and has RGB.
Maxsun 3060 Big Mac
- Dimensions: 170x125x40mm
- Essentially the same as the PNY, just different branding for different markets (I think).
Asrock 6600 XT Challenger ITX
- Dimensions: 183x122x41mm
- Funny name and plain looking aside, the only dual fan ITX(?) card at 183mm, will have issues with some cases, and with a backplate.
- Maxsun's target market seems to be only Asia as well, availability will be an added issue.
As ITX cards are generally tougher to find, there exists an ITX tax on top of the high prices now, so good luck on landing one!
- Dimensions: 179x124x40mm
- Only Radeon offering so far, but unreleased.
- Has a metal backplate, no frill looks.
new or used? If they are used, I heavily suspect they are just unloading mined cards