Could it be 'Casablanca'? If so, I believe I got mine from Bachman's. It should not be too hard to find.

'Casablanca' is the most common Oriental Lily. It will be available at big box stores and garden centers in February/March. It might not be hardy in your zone though. Asiatics would work better for you.

I have had Casablanca for about 12-13 years here in zone 4 MN. It's one of the few Orientals that has not only hung in there but actually multiplied. My guess is that it does fairly well, because it's one of the earlier blooming orientals and the foliage has time to ripen before a hard frost. It's still not as vigorous as the Asiatics, but does make a respectable clump.