you can go to

来源: 邮件激活 于 2010-01-22 08:30:52 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (163 bytes)

usps main center, and ask about umbrella cap

Yes, you can get discount for volume.But not worth it for small volume

http://caps.usps.gov/capsover.asp

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