While the game isn't officially due until tomorrow, the demo enables you to purchase the full version of the PC title from PopCap today. The company is asking $19.95 for its latest, with the "PLANTS10" coupon code knocking 10% off.
However, there's a cheaper option. Valve's digital distribution service Steam is selling PvZ for a paltry $9.99--half of PopCap's price. The full version unlocks tomorrow morning, with a free copy of Heavy Weapon included as a pre-order incentive.