 If a player gets knocked out a second time, and wants to reengancharse again, that costs 2 units, the third time costs 3, and so on.The count is kept separately for each player - after one player has bought in (say) the fourth time for 4, another player who is knocked out for the first time can still buy in for 1.Some play that when the stock runs out, the cards in the discard pile, apart from its top card, are turned face down without shuffling to make a new stock.