Currently they are running some 40th anniv. specials and re-releasing expansions in .PDF form.
Ogre 40th Anniversary Release: Shockwave
The game of Ogre has evolved over the years. Beginning as a humble Microgame in 1977, it has grown and expanded to become the beautiful monstrosity that was Ogre Designer's Edition, released in 2013. Celebrating its 40th anniversary this year, Ogre moves forward with Ogre Sixth Edition and the upcoming Ogre Reinforcements. This month, we're featuring digital re-releases of three classic, hard-to-find Ogre supplements: Shockwave, Ogre Reinforcement Pack, and Battlefields.
G.E.V. was the first expansion of Ogre. It was initially published as a stand-alone Microgame, focusing on the non-Ogre units and introducing rules for terrain, overruns, and more. These two Microgames formed the core of all future rules.
The first true supplement to the Ogre/G.E.V. line was Shockwave. Released in 1984 and reprinted in 2000, it brought Light GEVs, GEV-PCs, Marines, and the Superheavy Tank to the game. New targets were published as well, including reactors, strongpoints, hovertrucks, and more.
But that was not what truly differentiates this supplement! Ever wonder what caused all those craters on the Ogre map? Shockwave details rules for Cruise Missiles (and their associated crawlers) to unleash this massive destruction upon the terrain. Additionally, rules for Lasers and Laser Towers give the poor defenders a chance at shooting these devastating weapons down!
I have multiple hard copies of all of them and they're all great to play. Most of the material is in the ODE edition but the rules aren't in the OGRE 6e or the pocket edition.