Well, if you want to go as cheap as possible, but still have a passable weapon, try the following:
Mosin-Nagant M-44 or M-91/30, about $100.00
The M-44 is the better brush gun. Both are powerful, but the poor trigger pull takes some getting used to.
H&R "topper", about $70.00 used; 110.00 new.
Get one in 12ga or 20ga with an open choke (improved cylinder) or a rifled barrel. Use slugs. On Javelina or Deer at 25yards and less, "00" buck is good, if it is leagal.
A Mossberg pump can be had at Wally-World for $200.00-$250.00. Use the same ammo reccomended for the H&R shotgun.
Mossberg ATR, Stevevs M-200, Savage 110, H&R Handi Rifle, Marlin 336, Rem 710. All can be had complete with scope (except 336) for $225.00-$350.00. Get it in .308,.270, .30-06, 30-30(336), any Magnum you can shoot well....Whatever! These are the Cadillacs of low budget rifles.
You'll probably never NEED a gun. I hope you never do. But IF you do, you will need it worse than anything you've ever needed in your life.
IF we're not supposed to eat animals,
howcome God made 'em outta meat?