Andrew, check out royalcolors.com. I have shopped there for years and their quality is good. They ship to the US so hurry so you don't risk a freeze. Easytogrowbulbs.com in San Diego is another option.

I think H. Papilio bulbs tend to be a bit smaller with a different shape, but they bulk up and put out offsets. Soon you'll have A pot full. I find them a little unpredictable for blooming, but they are lovely.
K

I ordered mine from Easytogrowbulbs last year after members here told me it was a reliable source. I potted it up and it bloomed through December '12, and it was indeed Papilio. I was very pleased that it was correct, and it was beautiful to look at.

Thank you both for your help. I am hoping to order next week.

Andrew

Royal Colors told me theirs were 22-24cm iirc.

i don't think there is any guarantee that the papilios sold commercially are pure species but cosmetically the blooms look the same.

I heard people say that they prefer to be well rooted before flowering and mine haven't yet but i've noticed they are more robust than hybrids.