you can go to

來源: 郵件激活 於 2010-01-22 08:30:52 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (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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