I actually looked up Seaquest Seasons 1 and 2 right after I checked on Earth 2, and both are still being offered new from Amazon for around $25 per season. I also wish we would finally see an official region 1 release for Season 3, hopefully they will get around to it eventually.
In terms of...
Not that too many people here probably care about this, but I've noticed that the complete series of "Earth 2" appears to have gone out of print since the set is only being offered by third party sellers on Amazon. Hopefully Universal is planning a single sided disc reissue.
Another set that was quietly re-released on single sided discs about a year ago was the complete series set of "American Gothic" (The mid-90s series).
https://www.amazon.com/American-Gothic-Complete-Gary-Cole/dp/B01CE8QRW0/