bk - First of all, I know that all those USPS forms can be a hassle, but, just be thankful that you're receiving orders from overseas. (And I know you know that, so...)
Secondly, and I know a couple of us DRs have mentioned this before, but... If you registered for a free account with the USPS Online Services, you could print labels, postage
and customs forms online. Additionally, by registering with the USPS you would then qualify for at home package pick-up. This would also make it easier to track all of your orders, and even arrange for merchandise returns if needed.
AND the USPS offers up to a 14% discount when you use their
Click and Ship system.