Wouldn't it be better if you try to find portal sink in your local area as it will be more feasible to buy locally. My cousin has a sanitary store but i am afraid he won't be selling out of country.
However i have searched online for you and found one selling at Amazon here. https://www.amazon.com/Portable-Sink-Contained-Station-Water/dp/B00IJJQ71K








Are you looking something like this ?