Where can Nigerians get the best deal on overhead cranes?

Our factory needs to purchase a batch of overhead cranes, and has already asked for quotations from some well-known crane manufacturers. But we worry that simply comparing prices isn't necessarily the right thing to do. A set of overhead cranes must be used for at least ten years, which will involve a series of after-sales protection issues. I would like to ask if anyone knows about the crane market in Nigeria and the factories and companies in Nigeria that can provide after-sales protection for cranes. I would be very grateful if someone could answer.