Please which brand of (not too expensive) London used phones and laptops that can be marketable in nigeria? Graphic laptops to be specific.

Which site or store can I import or place other for a quality and cheap London used[b][/b] 'grade A' phones and laptops?

What are the cost and logistics involved?

What are the 'pro and cons' of this type of business?

Please anyone in this business should please help me with the above question.
Am a student. I just want a business I can do to help myself in school. Na me dey train myself o

I need your help good nairalanders!