mamajack ~ having a virus show up isn't a death knell for the whole clump. If you see it the first year of bloom, then you know it came from the vendor that way. However, the virused lilies in my garden are ones that have been around a while. Several years ago, I had a virused lily in a clump so I moved the healthy ones to an isolated area for observation and discarded the rest. Those healthy lilies are still looking good.
As Anthony was implying, it's safer to go with reputable vendors. Great lilies can be found at your better local retailers too.