The Calamansi and Gai Lan were added to the Fresh and Flavorful shop back on January 16th, but still haven't shown up in the actual shop?
There's a lot of items the shop has to cycle through, . It picks items randomly so there's no set system like there is for Dara's. You'll just have to keep an eye open :)
I was thinking the same thing. Thank you for making a thread about it. Looks like has the answer. ^_^