Ammunition Supplies.

Look, I know Ammo is pricey and only getting higher, so BUY NOW. If the Shit Hit The Fan right now, I wouldn't recommend going to wal-mart like the sheepel masses.

.22LR is around 1.75$ for 50 rounds of federal.
12Gauge slugs are around 1$ apiece.
12Gauge Buckshot is around 10$-15$ for 15 rounds. you can find 100 rounds for 70$
555 rounds of federal .22LR is around 18$ at wal-mart.
15 round boxes of Remington Slugger rounds are decently priced.
20 round boxes of .223 Remington or 7.62x39 are under 5$ even at wal-mart.
.357 Magnum is around 30$ for 50 rounds. you can find 1000 round bulk for 430$.
.380 is around 15$ per 50 rounds
9mm is around 15$-20$ per 50 rounds.
40S&W is around 15$ per 25 rounds.
.45acp 25$ per 50 rounds.
At military surplus stores 7.62x54r, .303british, 8mm, 7.5x55, 7mm, etc surplus ammo is relatively inexpensive.
5.45x39 is relatively cheap especially in bulk cans. (2160 rounds for under 350$ ammunitiontogo.com)
.308 Winchester/7.62x51 is really inexpensive in battle packs of 100-200 rounds.
22-250 is a little pricey retail, but check sporting good stores anyway.
.243 is around 13$ per 20 rounds at wal-mart.
.270 is about 15$ per 20 rounds.
30-30 Winchester is around 13$ per 20 rounds.
.30 Carbine is around 17$ per 50 rounds by Wolf brand.
.338 Lapua is around 100$ per 20 rounds for very good ammunition. 27$ per 20 for federal powershock ammunition.
.300 Winchester Magnum is around 18$ per 20 rounds and you can find 100 rounds for around 125$.
45-70 is around 30$-35$ per 20 rounds.
.50 BMG is around 5$ a round.

That is a basic list taken from Ammunitiontogo.com and wal-mart from memory.