Through research I have come up with some plans.
Plan 1We put the artwork on discs.
400GB / 5GB (about the amount of data that can fit on a DVD-R) = 80 discs
A 50 pack of DVD-Rs costs $30 x 2 = $60 = 100 DVD-Rs
In addition a service like kinkos could perform the copying.
So the cost would be $60 + kinkos service = I will call when I wake up tomorrow and find out.
Plan 2We put the artwork on 500GB harddrives.
External 500GB hardrives cost $200 each.
Chad, you mentioned an internal harddrive with a USB 2.0 enclosure.
Unfortunately, I found that a USB 2.0 enclosure that supports a 500GB harddrive costs $30 and a 500GB internal harddrive costs about $200.
Plan 3We put the artwork on 80GB harddrives. One member would keep the original.
400GB / 10 parts = 40GB
This is how we would split it up:
Two 80GB hardrives have part 1 of the artwork
Two 80GB hardrives have part 2 of the artwork
Two 80GB hardrives have part 3 of the artwork
Two 80GB hardrives have part 4 of the artwork
Two 80GB hardrives have part 5 of the artwork
Two 80GB hardrives have part 6 of the artwork
Two 80GB hardrives have part 7 of the artwork
Two 80GB hardrives have part 8 of the artwork
Two 80GB hardrives have part 9 of the artwork
Two 80GB hardrives have part 10 of the artwork
One person would have the master if say both harddrives containing part 4 of the artwork didn't work.
External 80GB harddrives cost $60 each.
Internal 80GB harddrives cost $41 each.
USB enclosure that will support 80GB harddrive costs $19.
With this plan everyone would have to be willing to share their 80GB harddrive with everyone else. Also, we could trade harddrives say one person wanted part 9 of the artwork, but had part 3.
Plan 4We come up with another plan. (This plan took the most research.

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Note: All these plans will require shipping costs too.