Finding sunflowers

I wonder why it's so hard to find plastic sunflowers. The kinds with dark centres. I would think they're quite common, but other than having seen it at one flower shop at Marina Square, all the rest I've passed by don't seem to have them.

I found out:

Seeds of sunflower can roasted and ground into a fine meal for baking or used to thicken soups and stews.

Dye is extracted from hulls and petals.

Face paint can be made from dried petals and pollen.

Oil, that extracted from the ground seeds by boiling, is used for cooking and hair treatment by some Native American tribes.

Medicinal uses included everything from wart removal to snake bite treatment to sunstroke treatment.

Sunflower petals are poisonous, so they shouldn't be eaten the way their seeds can be.

Jurong Bird Park use sunflower seeds to rewards birds training for the All Stars Bird show.

Isn't the sunflower simply amazing?