Beer
Jungle Beer Brewery
A range of local beers like the English pale ale, Kiasu stout and tropical wheat beer with guava and soursop are produced at the Singapore brewery and sold at specialist retailers like Cut the Mustard.

Frog
Jurong Frog Farm
Buy whole frogs ($12/500g), frog legs ($15/500g) and frog products like hashima ($18.50) online at their website.

Seafood
Changi Fishery
They offer wild-caught fish like seabass ($18/kg) and red snapper ($20/kg), plus lobster (from $65/kg), clams ($10/kg) and green mussels ($8/kg). Buy online at the website.

Soy Sauce
Kwong Woh Hing
This Chinese condiment producer is most famous for brewing light soy sauce (from $4.80) and dark soy sauce (from $5.30). But they also carry plum sauce ($3.50), soybean paste ($3.10) and a range of drinking vinegars in flavors like apple ($33) and black grape ($33). Buy online at the website.

Tortillas
La Mexicana
You can order up the flatbreads at their restaurants as well as retailers like Belmonte Latin Foods from $5 for a pack of corn tortillas. 

Vegetables
Quanfa Organics
Get green vegetables like sweet potato leaves ($2.50/300g) and spinach ($4.50/250g), plus herbs such as lemongrass ($2.50/150g) and sweet basil ($2.50/40g). Order boxes (minimum order $50) from the website.