Methylamine is watched and a gas, dimethylamine is gaseous too and kind of suspicious (drugs and WMD uses), diethylamine is out of the question for most of us too for the same reasons, amines with different alkyl radicals are uncommon and expensive, and dipropylamine will probably not work anymore (and still is kind of questionable).
Dunno if tri(m)ethylamine would work, probably not.