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