I've done a fair amount of research thus far into firearms and I hope this might help you, never ever use a 22, you'll just shoot off the roof of your mouth unless it's aimed perfectly, I was told it must be at least a 357 Magnum with 130? flat nose bullets. I think the average new price is about $600, I would love to hear others with real input not just guesses, you have to be careful cuz sometimes people don't know much about guns but think that they know specifics, I've had to go around with a lot of contradictory information but this is the best that I've come up with so far on a limited income. I'm thankful for the people who have helped me but unfortunately I've researched what they've said and it doesn't align what I've been told, I'm actually planning on purchasing a gun tomorrow getting the specifics finalized within the next month or two.
I should add that if you purchase a gun it's smart to go to a shooting range so the kickback doesn't throw you off and you just wind up shooting your scalp off, also be careful about placing it in your mouth That's why I'm going with a stronger gun so I know it will take out all the significant areas and won't leave me on a tube bead in a nursing home for the rest of my life with brain damage