I'd say that the best place to buy Vimax Detox, whether you're in Nigeria or any other part of the world, is the official website.
You can find them on vimaxdetoxtrial.com - and it seems like they even offer a free trial. So you can try a sample of your favorite colon cleanser absolutely free!
Although you might not think it, the literature on the Vimax website suggests colon cleansing is becoming an increasingly popular way to help digestion, and relieve everything from constipation through to stress.
Alternatively, you could ditch the whole colon cleanser idea and look for a relaxing spa somewhere in Nigeria where you might be able to splurge on an enema among other wellbeing treatments.