Caltrain tickets for cheap (4 ride zones 1-4; 8 ride zones 3-1)

4 rides zones 1-4 (within 4 zones)
Actual price: $26.375
Sale price: $20 OBO
Expire date: 13th July

8 rides zones 3-1 (within 3 zones)
Actual price: $40.75
Sale price: $35 OBO
Expire date: 6th August