I hadn't realized my friend, Bill Adams of Sunscapes Nursery in Pueblo had been propagating this plant: I bought two--I should have bought more: it keeps blooming and blooming. Better watch out what you wish for: you may get it sooner than you expected!
But there are more: Back in 1995 I went on a fantastic bulb foray with the Indigenous Bulb Society of Cape Town led by Rod and Rachel Saunders, who were tragically murdered a few years ago in the Northern Drakensberg. Not far from Middelpos we found Bulbinella elegans--a striking and desirable species found in the high karoo. Judging by how thickly it grows (if you clicked that link you would know!) it can't be too difficult to propagate. I know of no commercial source of bulb or seed for this
The ultimate prize, however, has to be Bulbinella latifolia v doleritica, with orange juice orange pokers. Alas, its range is lower down in the karoo--it's is not as likely to be as hardy as the others--but it would be worth trying in any case.
And if you research further, you will find dozens more species in these two genera: who ever thought these two obscure closely related genera could offer such promise in cold winter climates?