The individual season sets are the ONLY way to get them, Rakshasa. Unfortunately, they're absolutely "no-frills", no commentaries, no featurettes, no nuttin' -- but they're still worth getting. Minor caveat: Season One is both better quality and better value -- the second season was cut off early due to cancellation, so there are fewer episodes, but MGM's SRP is the same price as the first season set. Pissed me off so much I almost didn't buy it, but my Completist Gene kicked in, and I eventually relented.

I'd recommend getting Season One first, and if after watching it you decide you absolutely HAVE to have more OUTER LIMITS, then spring for Season Two.