Editing Warhammer 40,000/9th Edition Tactics/Necrons (section)

===Buying===
Since Necrons are the non-SM poster boys of this edition, you can buy into them fairly easily with the starter boxes. Find a friend who plays Space Marines, split an Elite starter set and a Recruit starter set and you'll end up with an Overlord, a Royal Warden, 20 Warriors, 3 Skorpekh Destroyers, a Plasmacyte and 6 Canoptek Scarabs for $75 US (assuming you've split the cost down the middle as well). 

In addition, the Necrons Combat Patrol Box comes with a blister Overlord (the Warscythe + Resurrection Orb one), 10 Immortals/Deathmarks, 3 Tomb Blades, and a Night Scythe/Doom Scythe for a cool $140 bux US. A pretty good deal on those models, considering that just picking up the Overlord blister, Tomb Blades, and Night Scythe on their own would total up to $140.

GW now also sells the Necron models unique to Indomitus that aren't in the starter kits (Skorpekh Lord, Cryptothralls, Plasmancer, and Canoptek Reanimator) as the "Royal Court set" for $110 US, which is a little pricey for what you get, but is the only way to really get these models without resorting to resellers (read: scalpers).

Warhammer 40,000 Imperium magazine is still stocked in many stores and contain groups of models + paint for US$13.95.  Issue 4 has $60 of models + a pot of leadbelcher paint for $13.95, pick it up if you see it for cheap Skorpekhs.