Cheaper calibers without being surplus.
The first thing that popped in my head when I read your post is "reload".
Everything is cheaper when you reload, and the ammo is better. Heck, I can reload 38's & 357's for cheaper than decent 22 LR rounds.
"Always place your clothes and weapons where you can find them in the dark"
"Understand that the enemy is not the enemy in his own eyes ;this may offer you an opportunity to make him your friend. If not, you can kill him without hate, and quickly."