You're way, way farther ahead than I ever got.
As for finding the anime, I stumbled on a dealer who was selling all of it in what's probably a Hong Kong edition for really cheap: NextDay Anime. Search on Kodomo No Omocha there, and you'll see all 102 eps on three DVD sets, for about $32 each. However! I have not used this place, I don't know how reliable they are, and I can't vouch for them.
Also, the English subtitles in Hong Kong editions can be very... idiosyncratic. Fair warning.
(Edit: fixed episode count)
-- Bob
---------
There is no spork.
As for finding the anime, I stumbled on a dealer who was selling all of it in what's probably a Hong Kong edition for really cheap: NextDay Anime. Search on Kodomo No Omocha there, and you'll see all 102 eps on three DVD sets, for about $32 each. However! I have not used this place, I don't know how reliable they are, and I can't vouch for them.
Also, the English subtitles in Hong Kong editions can be very... idiosyncratic. Fair warning.
(Edit: fixed episode count)
-- Bob
---------
There is no spork.