M-23 Katana: In the "Priority: Mars" mission, it will be given as a starting weapon.

M-27 Scimitar: In the "Priority: Palaven" mission, it is found in the main Turian camp on the ground as you exit for your first objective.

M-22 Eviscerator: In the "Grissom Academy: Investigation" mission, it is found on a red couch after saving the first student.

M-300 Claymore: In the "Attican Traverse: Krogan Team" mission, it is found in the abandoned camp in the left building just as you enter.

Graal Spike Thrower: In the "Priority: Tuchanka" mission, it is found near a guard waiting by the railing just as the mission begins.

Disciple: In the "Lesuss: Ardat-Yakshi Monastery" mission, it is found after discovering the lone Asari, and entering a combat room filled with Cannibals and a shield generator.

Geth Plasma Shotgun: In the "Priority: Rannoch" mission, enter the large combat area with the Geth on a balcony. Kill the enemies, then search right of the area's entrance to find this weapon.

M-11 Wraith: It can be purchased from Spectre Requisitions terminal in the Spectre Office at the Citadel for 250,000 credits.