Lastly, buy them from syndicates. I've got all the weapons and mods, so it's pretty much the only thing that I spend my influence on.
That's what I've been doing. I haven't quite been playing every day, but assuming I get all of my daily allotment (not counting the missions, which I rarely do), at my MR I average just over 1.5 pack per day (I'm liking the drop to 20k from the Key Packs' 25k).
Awesome avatar by Kurien.
Good Decisions come from Experience. Experience comes from Bad Decisions. Bad Decisions come from Tequila.