I rushed Magnetic Weapons research, and to my dismay found that I can't actually build any magnetic weapons in engineering because I don't have any alien alloys.
I know in the first game that shooting down UFOs was a good source of them, but near as I can tell I'm not doing any UFO blasting in this game. Not yet anyway.
Is there anything I can do to hunt down alloys (like choosing certain mission types), or am I just kind of screwed for rushing Magnetic Weapons too early?