i got this and the Early Snipe just in time. both of these are really important to me, the E.II/E.III can be built into the ship Udet got his first kill in, and i've got the Pheon decals to do Barker's VC Snipe.
Early Snipe will sell out soon, when the WNW site would tell you how many you could order the max on the EII/EIII early was 33 and Snipe 41. that was late December.
There were also less than 100 Roland D.VIb, and only 12 Junkers J.1, but single seaters appear to sell faster (and have larger production runs).
the Biff and Early Fee were around 100. The E.III late was at 138, it's popular, probably because of the markings (Richofen, Kobes, the Immelmann death plane, etc. )
on the other hand, if you're in the market for an Albatros B.II, no hurry: max order at the time was 1,442.
unfortunately they've disabled that feature on their site.