A method of customizing offers for sales of combinations of virtual items at discounted prices is disclosed. A combination of virtual items of a computer-implemented game is selected such that the sum of the values of each of the combination of virtual items has a proportion to an amount of currency in an account of a user of the computer-implemented game, the selecting being performed by a processor. An offer for a sale of the combination of the virtual items at a discounted price is generated for the user of the computer-implemented game. The offer for the sale of the combination of virtual items at the discounted price is presented to the user.