What is the cost to ship a iphone 4 hard case in a bubble mailer first class by USPS?

Undisclosed

Added (1). I would also like to know what size bubble mailer to use?

Who me?

Approximately $3, based on what I paid for a similar package a few weeks ago.

As for what size to use.whatever fits.

If you have more details on size/weight, you can calculate it here: http://postcalc.usps.com/

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