I doubt anyone is close unless if they bought a bunch of chests which had legendary tokens in the sale but what are you looking to eventually get? I think I’d like an item that speeds up university research (I forget the name)
The Enigma Machine and the Mars Sojourner Rover both have reductions to university research time. Since they recently had the Rover on one of the low-chance multi-chest sales, I'd be surprised to see either one offered as a flat 300-token deal. They know those are highly prized, so they'll make a lot more money selling them in a gambling format than as a guaranteed purchase.
There are probably a good handful of legendaries I'd consider spending 300 tokens on, but since I only have around 50 so far, it will be a while before I have to decide.