Military surplus powder?

[Kaos]

Im still trying to do the best cost analysis for when I finally get the funds (gift cards from cabelas likely) to start reloading.

I've seen a few threads around the net saying that milsurp powder is cheaper to buy, but Im not sure where to start with that.

This will be for .223/5.56 to start, eventually expanding into 9mm.

What kind/type of milsurp powder would be best for each cartridge? Is it even worth it?

Thanks!

Prices im finding are like $99 for 8lbs before hazmat fees.