I will copy what ALBATROS1234 wrote - the warning of low stock was there, and there were at least a couple of days before the two kits sold out. There is really no good reason to complain, IMHO.
As for me, I was right on time with the order. And, without any will to make angry those who did not, I will share my joy - my Albatros B.II has just arrived. I will see it in 8 days under the Tree!