There are starter kits sold by most manufacturers of reloading gear, RCBS, Lee to name a couple. RCBS sells a kit with most of what you'll need as far as hardware for about $250 new with all mechanical components. It sells one with digital powder measure and scale for ~$350. You can get a Lee setup for a little over $100. You can find them cheaper at auction. If you get RCBS they have a lifetime warranty that doesn't require you be the original owner.
To this you'll have to add a die set for each caliber you want to load. The die sets run between $12 and $25 depending again on who makes them and what they are.
You'll also need powder, primers and bullets. Powder is around $18 per pound, primers around the same for 1000 and bullets about the same for a box of 100 in .30 . All this can vary widely since you can get match bullets, magnum primers etc. Powder and primers also have a hazmat charge if you order them sent to you. You will also need brass if you haven't collected fired stuff; let's say between $5 and $20 for 50 depending on what and who's it is. Again, this can vary widely.
You will probably find that you need one or two other tools that these kits don't supply eventually for ~$20 each.
You will also probably find that, even though these kits come with a reloading manual, you'll probably want at least another one.
All these are very rough numbers to give you what you asked for. Probably others will come along and post 'Hell, I buy milsurp powder for $18 per 100 pounds' or some such. All I can say is, if you are a beginner stick to conservative, published loads.