I found out today that they will sell the disks individually near the end of October. I suspect that Columbia House will have its own packaging for each disk. I don't know the price or if the extras will be included either.
Are they just selling the Warner Bros. discs individually (4 epsiodes per) or are they doing their own 2-episodes per disc, few or no extras, "Columbia House Exclusive" edition, as I've heard they've done for other boxed set shows? That could make a real difference.
Of course, they were soliciting members for a B5 DVD club this spring, months before Warner Bros. announced the S1 boxed set, but then they got cold feet and cancelled the release and all the memberships along with it.