It is pretty cheap, but it's a better deal to get it in Japan if you consider the aftercare of the product.
It is pretty cheap,:結構安い
but it's a better deal:でも、もっと良い取引
to get it in Japan:それを日本で購入すること
if you consider the aftercare of the product.:製品のアフターケアのことを考えれば
という意味になります。