Got these June 2023 from Parts Connexion, not ebay or Aliexpress where they're cheaper (and possibly lesser performing)

https://partsconnexion.com/products/tube-new-shuguang-treasure-300b-z
Currently sell for $280+ shipping on sale. I paid $355 shipped for them.

Both are $225 shipped!

Box began falling apart some upon arrival but tubes have been flawless. Top of latch was already detached when they arrived.

Similar 300b knockoff sound as Gold Lions. Only selling because I have another extremely similar looking and sounding "Cossor" branded ones. A couple hundred hours on these at most.
Some reviews:
https://6moons.com/audioreviews/shuguang/treasureseries.html
https://blog.thetubestore.com/300b-tubes-review/ (came in 2nd among lower cost 300b)