@GamesPoet - it's gonna be a challenge as they've been a direct only item for at least a year. Maybe check some brick and mortar stores, maybe there's a box somwhere out there, sitting on a back shelf?
@Atchman - there's a lot of alternatives, but unfortunately very few things match the heroic scale of citadel. The proportions and height of the Warlord's, Perry's and other historical miniatures just looks way off (at least to me). I'd have to start a whole new army, using nothing but the historical models and that's not what me and many others are after - which is expanding our current forces. That is going to be more and more difficult over time.