Hello Bothrasunil,
I can now tell you that you will have as much vegetables as you want here in congo. it's just that i can be expensive sometimes.
for example, during dry season, vegetables are big, healthy and cheap. in raining season, the prices are different.
plus here, apart from local vegetables (which you can have in the market at good prices), there are many supermarkets with a large collection of vegetables at all season.
I hope this will help you.
Ruth