The "high quality poly-stone" figure is limited to 350 pieces worldwide and comes with a hefty $150 price tag, so it's advisable that you do not fire seeds in its direction in an attempt to halt its advancement. For $150, it's allowed to trample your azaleas.
The exclusive Peashooter figure is priced at $80 and is also limited to 350 pieces. For $10 less you can nab the non-exclusive versions of each figure, which removes the orange cone and pea items from each figure.
Both characters are available to play with for free in Plants vs. Zombies 2.