Who has to pay for the stones in an execution?

My wife turned out to be quite nasty in the last years. because my wife was not a virgin at marriage - and Deuteronomy 22:13-22 states clearly that this in fact nullifies the marriage and the woman should be stoned to death (Deuteronomy 22:21) How do you usually fix a date for this event with the the men of your city, and who has to pay for the stones?