Going up against zombies this time are plants in PopCap’s defense force game. To let gamers get a taste of what to expect, they have released a tiny demo that lets you play the game for thirty minutes.

Those who want to get more of Plants vs. Zombies action can shell out $19.95 to purchase the full version today. PopCap has a “PLANTS10″ coupon code that knocks 10% off their stated price. However, if you’re feeling frugal, there’s always Steam, which is selling the game for half price – $9.99.

The full version will unlock tomorrow. Those who pre-order will also receive Heavy Weapon.