I recently bought a Rockchucker Supreme Master kit from Bass Pro USA which will come in around $360.00. They say it has everything you need to get started, but in my case that wasn't necessarily true. All of my brass was over the max length, and needed trimming, so another $140 at Russell's Sports got me a trimmer, which isn't included in the kit (I would've gladly paid more for the kit to get a trimmer as well, as I don't see how a kit that is supposed to have "everything you need" doesn't come with a trimmer

).
My next biggest cost was a tumbler, again from Bass Pro USA (almost 1/2 price of here in Canada). Now a tumbler IS an optional item, but I didn't feel like rubbing and scrubbing crap off my cases when I could just set it and forget it, and come back to sparkling brass a few hours later.
You can buy cheaper equipment, but I look at it as an investment, as you will have it for a looooong time, and most of it will depreciate very little if given some care. All in all, I am into it for about $750 or so, for all the tooling for 3 calibres: .30-06, .223 Rem and .38 Spec/.357 Mag. The components are extra, but are pretty cheap: Around 30-40/lb of powder (7000 / amount of powder per charge will tell you how many rounds you can load with a pound of powder), around $20-40 per hundred bullets depending on calibre and type, and 30-40/1000 primers, sometimes more.
Finding some of the components will be frustrating, as right now you cannot go to your local gun store and pick and choose components listed in your book on a whim, you will experience shortages in the most popular powders, primers have been tough to find, and .308 and .224 bullets are especially tough to find (except for the premium hunting bullets if you're desperate, but there are cheaper (and less available) alternatives for target shooting/plinking.
Overall it's very satisfying putting your own ammo together, and knowing that it is very consistant shot-to-shot (directly proportional to the care and attention you put in to each round).