Saints have used the Blades to cut admission prices for their third round tie in the AXA sponsored FA Cup.
Their January 6 clash at home to Sheffield United will be all-ticket with no cash admission on the day.
Children will pay just £5 while adult seats cost £20 in the centre stands, £18 in the wings or behind the goals, £16 in the lower tiers or £15 in the family centre.
They are now on sale to season ticket holders who have until 8pm on Wednesday December 27 to guarantee their own seats.
Members can purchase tickets from 11am on December 27 but they will not be able to buy any unclaimed seats normally taken by season ticket holders until the following day. Any unsold tickets will go on general sale at 9am on Tuesday January 2.
Tickets for the December 30 home game against Derby will go on general sale at 9am a week today.
Saints' FA Youth Cup fourth round tie at Leeds will be at Elland Road on Tuesday January 16, the same night as any first-team FA Cup replay at Sheffield United. Any FA Youth Cup replay will be at The Dell on Wednesday January 24, 7pm.
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