How much does it cost for a years worth of baby formula?

according to this website i just found it costs between 1200-3800 a year for the formula alone. I'm assuming the range is due to different types of formula that can be used - cow milk based, soy, powder, pre-mixed etc...

* It also depends on the brand you purchase! Name brands are much more expensive than their Store Brand counterparts, but they are all nutritionally equal. There are so many options when it comes to infant formula, but there is really no reason to pay $20-30 per can when you can get essentially the same thing for half the price, and in a larger amount! We used Parent's Choice, Walmart's Store Brand, and saved over $1400 by the time we were done with formula. You can save this money with any Store Brand.. I know Target, CVS, etc all have their own... Walmart's was just easier for us.