My peak impressionable years ended almost exactly the same time the magazine did, and my library had every single issue on microfiche.
Still available for purchase at Amazon, though:
https://www.amazon.com/s?k=omni+magazine
=-=-=-=
TFA is just rambling on about the origins of the magazine, but the archive is supposed to be here:
https://omni.media/channel/omni-archive
But on my end it appears that the domain is down.
It says there a Vimeo on demand series, but it’s gone
It says you can check it out on their website, but there’s nothing there