Last time I saw my nephews one of them had purchased and was showing me whatever version of Unicron that Hasbro made available after this, which I was told was still over $300 (YIKES!!!!!).
His was definitely smaller than the one shown by Rylen, but still stood a good foot tall in robot form. Certainly the sort of toy I would have gone nuts for as a kid, but not at a price point of over $300.

I must have heard the price wrong, this is the figure of Unicron he has.:
https://www.thechosenprime.com/01studiocell-2