Well to be honest, it depends on how much you are willing to invest.
Can't you buy a used Xperia X or XA2 in Nigeria? Probably that would be a better option:

My testdevice is a Jolla1 in nearly perfect conditions. If I would sell it to you for let me say 70 €. There are still transport costs. I've had a quick glance on the DHL website. Transport costs would be nearly 20 € but just insured up to 50 € and not knowing if it's a problem to send it with battery included.