Pompey have cut ticket prices for the crucial relegation clash with Bristol City.
The fellow strugglers visit Fratton Park on Saturday in a critical six-pointer.
So far 12,074 tickets have been sold for the occasion - including 600 away supporters.
In the drive to get fans out in force to cheer their team on, the club have brought out several ticket offers.
Now two adult tickets can be purchased for £19.50.
These apply to the North stand upper wings, North stand lower and the Milton End only.
In addition, extra adult tickets cost £9.50 and extra junior tickets are priced £5.
Pompey are hoping supporters will snap up the offers and bolster attendances which have recently been boosted by the Pack the Park campaign.
A raft of ticket price reductions have also been announced for the visit of Birmingham (March 20).
The club are running a Four for £44 offer, which means two adults and two juniors can attend for just £44.
In addition, there is also the Two for £25 scheme, when one adult and one junior can watch the Blues in action for just £25.
These apply to all areas of Fratton Park except the Family Enclosure and Milton end.
This offer is available by calling 0844 847 1898 (option one).
Alternatively, fans can visit in person from the Frogmore Road ticket office.
The offer is subject to availability and is not available on-line.