The first five or so episodes are on YouTube and the first three episodes (which make up the pilot) are very easy to find, mostly because those were all released on VHS. Most after that are really hard to find and if you want to see the very last episodes, you're pretty much SOL.
Netflix had the entire series available for streaming, but it left.
As of February 19, 2013, a complete series set is available on DVD from Mill Creek Entertainment.
