A few people pointed out this news from Tux Games at the end of February regarding their remaining inventory of Loki games:
Despite our best efforts to continue to obtain the now discontinued Loki titles, finally the inevitable has happened and one of the Loki titles will no longer be available from our store. Alpha Centauri has now been discontinued.
For anyone that is still missing a few of the Loki titles to complete their collection, we still have a few of the rest in stock, but they wont last forever. Come and get them whilst you can!
A few of the top-selling / favorite Loki titles at TG: