Apple attached 5W charger in the new iPhone 8, iPhone 8 Plus and iPhone X retail box which is the same charger they have been bundling for ages. In order to have fast charged you need to buy a separate charger and cable which they won’t be cheap, either.
Apple just tested the new iPhones with the USB-C 29W charger it supplies with the 12-inch Macbook as well as the 61W and 87W power adapters. The 29W charger costs around €59/£49/$49 which is equivalent to NGN 17,300 in Nigeria. Then you’d need a USB-C to Lightning cable, which goes for €29/£25/$25 which is equivalent to 8,800 in Nigeria.
You could go for a third party combination, which is generally a bit cheaper but still expensive. Finally, a 29W charger is much bigger than the standard Apple charger (and most Quick Charge-capable USB-C chargers).
But if you already have the charger from your Macbook or an iPad Pro then you’re just 1 cable away from having Fast Charge on your new iPhone.