You can.
The website preview piece lists "On The Day" prices without directly saying that you can buy on the day.
However, there's no info on where you go to buy on the day, or where you go to collect if have already purchased.
The quality of away ticketing info provided by the club in their previews/ticket news piece is generally very poor.
They've just released Lincoln ticketing info but fail to mention it's an international weekend so is potentially at risk of postponement depending on the call-ups for either side. (We have Beadle, Brown, Harris, McGinty, Negru, Smyth who have all featured in, or been on the fringes of full/youth international squads in the last year)