Sales at WHCS until 3pm.
Tickets can be bought in person at the windows until 2pm, with phone sales until 3pm, with those tickets to be taken to Sixfields to be collected on the night.
Fans will also be able to buy tickets on the night at the Cobblers' home ground, but the advance saving for Season Ticket holders will not be available on the gate.
For full details of Tuesday night's prices, click HERE.
The U's take on Gillingham in their next home game - buy your tickets now at the Saver rate!