I'm entering the 2nd month of the game (started over because of changes to the save-game file), and I've just researched the UFO-Scout.
Now, antimatter is a hard thing to come by, because you can only get it from UFO's and the aliens...
But look, there's 84 for sale on the open market...
If someone will tell me how to do a screenshot (is there key?), I'll provide one.
Thought you'd want to know...