The complete Robotech series is available as digital downloads on Amazon.com, iTunes, and Xbox Live. Each major story arc -- Macross Saga, Southern Cross and New Generation -- is sold seperately. You can also buy or rent the sequel to the series, Robotech: The Shadow Chronicles.

That said, it's not particularly affordable. Buying the Protoculture Collection of the complete series on DVD is only $79 on Amazon ($129 retail); it's $112.97 for the whole series on iTunes. You can also buy individual episodes for $1.99, which seems pricey given that each episode is only about 23 minutes long. It's not a bad price to sample the series, but personally I can't see buying the entire thing in digital format when I could have the series on DVD for significantly less.