In the U.S. Fortress Maximus retailed for $89.99 (a bit less on sale, a bit more when sold by certain chains.)

Stepper used to fetch the same insane prices as Artfire, but the release of the shelfwarming Stepper/Ricochet reissues killed the vintage values.

Minerva was the first female Transformer toy and is far more conspicuously different to Nightbeat as a toy than Go-Shooter is to Siren.

Shortpacking did not occur in the same extremes as it does today. The only real case I can think of off the top of my head where it affects the value of a US toy is with Targetmaster Scourge. He was only available in 1987, wasn't released in most countries and when he was he was shipped in a ratio of 1:12 toys. And he's never been reissued. Hence his (and Fracas's) rarity today! (For anyone wondering, Cyclonus was 1:6 1987 Decepticon Targetmasters.) Bumblejumper/Bumper is also supre-rare, but it's impossible to work out how many were released since he was a random 'variant'.