I'll post this just in case anyone's interested in the info and didn't already know. I'm always looking for the highest quality of this show because I love it a lot and it's not properly on DVD or Blu-ray, so here's the result of my research to satisfy my curiosity: I believe that SD WEB-DLs for Season 1/2 were sourced from Amazon. They have video quality that's very close to these upscales when I compare them in motion by flipping between them in VLC, as well as comparing still frames, and at only 1/4 the file size because they're not upscaled. In addition to having the channel tag and taking up 4 times the hard drive space, these upscaled ones also have an incorrect gamma (compared to iTunes and Amazon) when played with VLC and looking at the posted screenshots - they're too bright. Anyway, not counting on a physical release, let's hope in the future that both Amazon and iTunes upgrade all their content including SD to higher bitrates as streaming gets better, so that we'll have better versions in the future!