Oh, and cheaper if you have the Prime account

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As a Prime customer, you will enjoy the following

11% discount on subsequent 0.5kg shipping rates
No consolidation fees
Reduced repacking fees
Reduced BuyForMe fees
Additional free storage extended to 60 days
Express delivery upgrade for all shipments

I suppose it to be 3 shipments. Enjoy the prime status for 6 months.
If you make another 3 shipments while still on Prime, your status is automatically extended for another 6 months from the original expiry date.

for comgateway, they normally calculate the shipping charges based on weight or the package dimension? i had the viaddress shipped to me before and they calculated based on the dimension weight and the shipping fees were so expensive