Unlimited Grenades, Shotgun Shells, And First Aid Sprays.
When you leave the last cabin on Disc 4 you will
find two grenades, shotgun shells, and various
first aid sprays in the snow. Pick these up, then
re-enter the cabin. Go back outside and all the
items will be there again. Note: This also works
by saving than restarting your file in any place
on the last path.