Be careful to use Amazon Shipping ($6.9 Pickup Fee)

I had used Amazon Shipping label purchased from Amazon Buy Shipping service, because sometimes it was slightly cheaper than USPS or UPS, but such package (tracking started with TBA) need to schedule the pick up with Amazon.

Recently I just found Amazon charged $6.9 for each pickup each package, even they made a single pickup for multiple packages. Such fee was only mentioned in their "Service Guide", not elsewhere. It was supposed to be included in the shipping price in Buy Shipping Service, not like this hidden fee. Their shipping price would become less competitive with this pick up fee.