make it from scratch, cheapest way to get it, nobody else will sell you half a titan...literally nobody. Even less chances if you're asking for it at cheap prices, FW stuff sells at a price similar to the real stuff, sometimes even more expensive, especially if it's OOP. FW is expensive no matter what.
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The Dark Moon Kabal
The Biggest Kabal ever, be sure to check it out if you haven't, old and new units.
The Biggest Dark Eldar Apocalypse force you'll find on the net.
My Eldar Facebook Page, feel free to join. All Eldar factions allowed!