Postponing its activity is futile, as a horde of zombies will approach while the player hoards sun. As per the Plants vs zombies wiki: Extra Seed Slot ten - $80, (unavailable on iOS, Mobiles with Samsung bada OS, DS, and Android because. At the beginning of the game. They have different designs in each game. There is no room for the 10th slot on the DS/DSi/3DS Touch Screen. In Crazy Dave's car I see the slot being sold for $80, but it has a sold out sign over it. When will I be able to purchase this? plants vs zombies facebook game. MegaSuperab - 11 years ago - report. Seed slots represent the number of seed packets the player can bring into a level. Matching two of a plant on the slots awards one seed packet. . Unfortunately, you can't.