Right stuf has great prices, Bandai entertainment tends to ship a little sooner for new releases, and Anime Nation is where I managed to track down the legitimate release of MS Igloo.
As far as what has been legally released on DVD in the US:
- MSG (series and compilation films),
- Zeta (series and compilation films),
- Char’s counterattack,
- 0083 (series),
- 08th MS Team (series & Miller’s report),
- MS Igloo (both Hidden One Year War and Apocalypse 0079, both are out of print),
- Unicorn (episodes 1 & 2),
- Wing (series),
- Endless Waltz (OVA and movie versions),
- SEED (series and compilation films),
- Destiny (series, Final Plus, and compilation films),
- 00 (series)
- 00 A wakening of the Trailblazer
- SD Gundam Force (both seasons, discontinued)
- G-Saviour (discontinued)
Additionally, A wakening of the trailblazer and episodes 1, 2, & 3 of Unicorn are available on Blu-Ray, while both PSN and Zune(Xbox/Windows) have Unicorn and some of the compilation films available to rent (including the 0083 compilation film, which has not had a North American DVD release).
MSG’s DVDs will be rereleased as two anime legend boxsets, with the first half coming in mid-September.
Turn A Gundam has been licensed and will be released “in the fall”, continue to check store.bandai-ent.com for a more specific release date.
Legally licensed North American DVDs will be region 1 and are licensed to Bandai Entertainment (Igloo is licensed to Honneamise/Bandai Visual USA*). Legally licensed Blu-Rays are region A (be warned this is the same region as Japanese Blu-Rays); the North American release of A wakening of the Trailblazer was done by Bandai Entertainment, while the Unicorn Blu-Rays are being released by Honneamise.
*Honneamise used to be a separate region 1 licensor under the direct control of Bandai Visual Japan, until it was folded into Bandai Entertainment as the premium label a couple of years ago.
ZZ, X, Victory, MS Igloo 2: the Gravity Front, CE 73 Stargazer, the 00 compilation movies, AGE, green Divers, Evolve and anything SD (other than Gundam Force) have not been legally licensed in the US. Any DVDs you find of them will either be bootlegs or the Japanese releases (which are region locked and do not contain English subtitles).