Even if the gun is incredibly cheap, it doesn't cover shells. Keep in mind in some blueballed states, you need a standard license to even buy ammo - otherwise, people could just assemble an Uzi/AK-47 kit for ~$200 and be done with it. The closest solution is using the Darknet to have someone else buy your ammo or stealing from your gun nut neighbor a couple rounds, but I don't think even /k/ has anything to say about that.
Also, anybody who says Helium exit bag hasn't been paying attention recently. Helium shortages since 2012 have started companies like Balloon time to mix air with Helium, causing the brain to be less starved over time to where you're more likely to be found alive than dead. I've heard butane being a good replacement for it, but last time I asked for it they thought I meant propane. I managed to find Butane, but they required welding torches to work. However, they make carbon monoxide when lit, so you can die if you had a closed environment where you couldn't burn anything.
Meanwhile, you can mix bleach and alcohol to make chloroform, which not only knocks you out, but doesn't cause rusting and other property damage unlike chlorine. If there's a way to make it more portable than mixing it in a bucket, you can mix it with a bunch of other methods to still the nerves as you die.
So, best ways I can devise so far:
1. Make your bathroom a DIY gas chamber with tape, tarp/plastic sheets, and torches. Find a way to stand the torches up and stay up, tape up the room and torches for a constant gas flow, light them up and wait. Feel free to strike a buddhist pose. If the torches go out, there's enough CO to kill you in the room.
2. Make a DIY gas chamber out of your car with tape, bleach, and alcohol. Tape up all doors, window cracks, and vents; mix the chemicals in the bucket (make sure to do half and half), and wait. If you survive and a cop's tapping on your door, you don't have enough chemicals or your spot isn't remote enough.
3. Lay your head on the tracks before the crack of dawn so the train can hardly see you. Helps to have chloroform, booze, and/or meds so you have slow reaction. Try to go up the track as far as you can so the train will reach top speed and no witnesses.
4. Just get a rope and head to the forest preserve/highway forest. If you do this at night, most parking lots will be closed and be crawling with cops, forcing you to walk. Use your rope to climb the tree. Try making your rope as short as possible, but if you make it long enough and have a tall enough tree, your neck will snap instantly.
That's what I have so far. Thoughts?