Back in 2022 Super 7 released a 6" Unicron figure based on the unreleased prototype of the character from the 80's (which you can see on The TFWiki. Today, Super 7 posted a listing for a redeco of that figure in colors based on the very first Unicron prototype created (preceding the more well known one from the 80's). The figure is $25 USD and is available to ship now. Check out the official product info and pics below:
Unicron (Prototype)
The mighty Unicron is a devourer of worlds and has set his sights on Cybertron! Only the Matrix of Leadership stands between him and galactic domination! This articulated, 6” Transformers ReAction Figure of Unicron is inspired by the 1986 animated film Transformers: The Movie; the colorway is based on a Japanese toy prototype that ultimately was never produced! This is your chance to own the toy that never was and if you pass up the opportunity to secure this Unicron Transformers ReAction Figure for your collection, you may just end up being devoured by a world of remorse!