First buy Bouncing Bettys.

Get enough points to get a Perks-a-Cola and the gun right by it.

Go right in front of a Perks-a-Cola and throw down the first Bouncing Betty.

Throw down the second.

After you take out the flip, buy the Perks-a-Cola.

Your two guns that you have will disappear, then buy the gun right by the Perks-a-Cola, then you have a third gun.

You can get 6 guns but from different perk machine.