I only own my own mask, snorkel, boots, and fins. The package for everything cost me under $200 for everything and it's all pretty high end equipment. The certification will cost you anywhere between $400-$700 for full open water depending on where you get it at and what time of year it is. As for the rest of the equipment-BCD, regulator, weights, wetsuit, etc, they all can be rented for a fairly cheap rate, and if you're traveling it can be cheaper to rent equipment rather then pay to check them for most airlines. Once you know you want to keep it up and go diving fairly often then go ahead and buy your own setup but you might want to wait on the major purchases at first.
