I have a large tyranid force that I am willing to trade for necrons. I have 2850 points of tyranids (without any biomorphs/wargear) that I am open to trade for a necron force of a the same or maybe less value.
Here is a link to the ebay so you can see what all I have to offer.

[url]www.ebay.com/itm/Large-Tyranid-Army-/121139983199?pt=Games_US&hash=item1c3481735f[/url]