Some pre-sale or crown funding  item, the sellers will separate the full price into deposit and remaining balance.  The preorder price usually will be cheaper than the price when the item is available. If you dont mind waiting, it is a  good way to buy and save money.

Deposit usually is 5%-10% of the item price, buy the deposit to join the preorder or crown funding. But pls be aware, once order the deposit, cannot refund or exchange. 

Remaining balance is the full price minus deposit. Usually come out after 1-2 month or the sample come out.