If you/yr family & friend have company account in DHL, the cost of sending by DHL is similar to speedpost(if the weight is the same).
But remember that speedpost only count on weight.
DHL count on voulme as well.
For example: package weight = 22kgs
Size = 50cm x 50 cm x 50cm = 125,000cm3.
(Weight = 125,000cm3/5000 = 25kgs)
Then DHL will treat this package as 25KGS iso 22KGS.