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<p>[QUOTE=&quot;physics-fan3.14, post: 6448692, member: 19165&quot;]If it&#039;s empty, media mail absolutely qualifies, and is probably going to be the cheapest. In my experience, media mail is often kinda slow - but if the buyer is okay with that, then it&#039;s your best bet.&nbsp; </p><p><br /></p><p>If there are coins in it, the weight may increase rapidly. In that case, the USPS offers a &quot;flat rate&quot; box or envelope - the cost is the same no-matter the weight. I think it&#039;s about $8. That would definitely be the cheapest option.[/QUOTE]</p><p><br /></p>

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