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TELL ME IF THIS HAS BEEN POSTED BEFORE AND DONT FLAME ME
This is a trick my friends and I use to get as many weapons as we want. It will help those of you that need to upgrade 5 weapons.
1) This trick requires you have at least 3 players. It works better w/ 4 players. Also, another tip...don't waste your $$$ on perks until at least round 15 or 16. Up until that point, use all of your $$$ to aquire extra weapons.
2) If you have 4 players, just have a person hold a zombie at a window at the end of a round. If you have 3 players, you will need to make a crawler (or several crawlers) at the end of a round to get this done.
3) Now, for the trick. If you have crawlers, make sure to stay away from them so your grenades don't kill them and end the round.
4) One person cook a grenade and down themself. As soon as you go down, HOLD X and don't let go.
5) A second person downs themself RIGHT NEXT to the first person.
6) The 3rd person will revive ONLY THE FIRST PLAYER THAT GOES DOWN. If you mess up and accidentally start to revive both players, the trick won't work.
7) When the first person gets revived, he will get up and instantly start to revive the other guy. When he's done reviving player 2, he will be without a gun. Now, just go to the mystery box or buy a gun off of the wall.

Keep repeating until you are out of $$$, and then start the next round.
Some other things:
- This won't work if you have the Ray Gun or the Magnum. I don't think it works if you still have the Colt, either. The reason: When you go down you will pull out your pistol. If you have either of these guns in your arsenal, you will automatically pull it out when you get up, thus ruining the trick.
- To save on grenades: When the first person downs himself with a grenade, he can release "RB" after he's down and chuck his grenade at PLAYER 2. PLAYER 2 can then grab that grenade and run up next to PLAYER 1. If you do this, though, PLAYER 2 must be quick in picking up the grenade and getting over to PLAYER 1, because it has a really short fuse. This is the way my buddies and I do it every time. TIP: If PLAYER 2 stands next to a wall, and PLAYER 1 downs himself within 10 feet, it should work a little easier.
- You can always buy extra grenades off of the wall. They are located near every teleporter.
- Sometimes the trick just won't work. It'll be stubborn. My suggestion is to just move to another room and try it there. That's what works best for me, just trying different spots.
- If you are low on $$$, and the mystery box hates you (and gives you molotovs...ugh), you can always go and buy the Kar98k off of the wall by the PAP for only $200. Also, the Gehwer and M1A1 are only $600 if you need them to fill the slot.
- When you are standing there weapon-less at the mystery box, GRAB ANY GUN IT GIVES YOU. Just go ahead and fill the extra slot. If it's a gun you don't want (i.e. the Ray Gun, Magnum, Kar98k, etc.) just take it anyways. You can swap it out for another later. This will keep you from driving everybody else in the room crazy while you waste your time and $$$.
- When you upgrade a weapon in the Pack-A-Punch, it'll want to swap it out for another weapon (thus, losing a gun). There is a trick that'll let you swap out weapons without losing anything.
- The Pack-A-Punch Betty trick:
First off, put your gun into the PAP machine. Now, switch to a crappy gun (just in case it takes you some practice to get this down). Oh yeah, you have to have at least one betty for this to work, so don't use both of your betties in a round...only 1.
Now, when your gun pops out of the PAP, this is what you're gonna do: Switch to your betties and then press X to grab the weapon. It's a timing thing. Don't try and do it too fast. Just (RIGHT ON D-PAD, X). You will switch to your betties, and then grab the gun outta the PAP without losing another gun. Trust me, it works. It took me about 5 tries before I finally got the timing down, but I haven't lost a gun into the PAP since. Just don't try and go too fast.
I hope I'm not leaving anything out. If I did, I will just edit this post. It definitely can be tricky to do, but once you get used to all of the little tricks, you won't want to play zombies any other way. The other day my buddy had every gun upgraded out of the box, and I had 10 upgraded guns. It's just badass.