I just tried this glitch and it still works. Watch the video to see how it's done. Very easy to do.

http://www.youtube.com/watch?v=swi54wVeZ7s

I'm not much of a glitch-exploiter but... Interesting.
I wonder if that would work with mini-nukes too

Oh, I dont know but I do know that there is a Boomer you can snipe without being seen who has a Fatman and 3 mini nukes. After you kill him he will respawn every 72 hours. It's legit. I also want to add that you may have to put one Alien Power Cell in the merchant or mercs pocket (very easy) for them to try to use the Alien Blaster so your ammo can be multiplied after you kill them. You get an average of 10 APC every time. It may say only 7 or so but when you pick it up it turns into 10 or more for some reason.