Since much of the cheap .223 ammo has crimped primers, it can be a pain. The tooling to remove the crimp isn't expencive or hard to use. It simply eats up time. Same thing with trimming. It isn't hard to do, but it takes time I'd rather be spending shooting.
If all you need is standard 55gr factory spec ammo, by all means check out the dealers on this sit for deals. Save your brass anyway, as one day you'll want it.
If you will want to be shooting the heavier bullets, you will need to load your own.