You can put your item in a small flat rate priority box. You get a discount using labels (I think it's 4.90).I would stay with that little box for shipping.
If your item bulge the box, then you should ship First Class & buy bubble mailers. You can still charge $5 to cover the cost of mailers, & the postage will be less (so long as the package weights 13 oz or less).
If you want Priority for the convenience of free boxes, then the next possible size is 6 x 4 x 4, but it's not flat rate. The online postage is 4.90 to 6.20 by zip (you select the calculator in the listing). The box weighs 4-5 oz so your item need to be under 11 oz so that total is 16 or less.
I think this would be the cheapest & most reliable way to ship via USPS.
Redacted & modified to your specific query.
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Last edited by SUVE; 05-04-2012 at 10:00 AM.
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