Since this post mentions a grey market trading site, I just wanted to point out some important notes to keep in mind:
Anyone who sells to you can submit a ticket to CIG at any time to have the ship returned to their account and you would be powerless to stop it (CIG acknowledges grey market trades but they will not get involved if someone scams you).
Buying through the grey market does not count towards concierge.
Melt cost will not necessarily be the purchase cost. Ex: You may pay $500 for a ship, but only be able to melt it for $200 of store credit.
It's possible to earn this ship in-game. It costs ~20million aUEC at Area 18.
It's possible to borrow/hijack a Valkyrie and, as long as you park it in your hangar at the end of every session, you can continue to log in and fly it.