Hi Senorgabriel,
I just got started, too. My mask cost about $50, the fins cost about $120, the snorkel cost about $19, and the wetsuit booties cost about $25. Most of the other gear you'll need is provided by the diveshop as part of the course, but some shops charge extra for rental, I've heard.
I started to go the ebay route for some of my stuff and I was told its a good idea to buy your gear from your local dive shop, even if you can find it online cheaper, for the simple reason that the dive shop will stand behind what they sell you. Plus, you'll be getting new gear rather than someone's castoffs, which might have some flaw that is causing them to sell it.
Good luck, and I know you'll have fun! Please let us know when you get certified!