look on a online shopping site
Ebay
Actually, you can't. Only in "ultimate custom night" you can get plushies. If you are talking about the plushies you can buy at Target or any other store, then go online shopping and buy it or go to the shop face-to-face and buy it.
toys r us
South Park plushies are very rare. The only place i have seen them for sale is the Tobacco Station. Otherwise just try claw machines.
Buy a white Chao from the black market
You can buy some at the Japan section of Epcot in America. Some are usually for sale at Pokemon World card tournaments. If you can't find any at any of these places, go on Ebay (there's always plushies on Ebay!).
You can Buy them Online or at Anime conventions.. the anime Convention i wen to i got a Miku Hatsune Plush
You would breed a yellow chao and blue chao. Or you could buy a green chao egg from the black market.
"Furries" are alive. Plushies are dolls.
monotone chaos are the chao that you buy from the black market
Chao Fruit are food that you can feed your Chao to increase its Stamina stat. You can find Chao Fruit in the Chao Gardens, or buy them at shops in various Sonic games. Hope I helped!
Jewel chao are chao that have the look and colours of jewels. You can buy them if you have a gameboy advance and game link cable. They're expensive though.