Currently Dens of Kubrow and Tubemen of Regor! (Whoa, 2 at once!?) Rewards - Stun Wraith (Den) and Badge plus Karak Wraith or Dera Vandal (Tubemen) 4d for Den, 5 for Tubemen.
Necroing this for public service announcement. There will be event this weekend with high-reward alerts and Wraith Twin Vipers as main price. So, if you haven't got those now's the time. They are fun sidearm and even quite viable with right mods. My Ninkondi is ready.