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@northsidetrading wrote:

I don't do that.

I notice when sellers go cheap on postage and my item arrives damaged. An envelope will not protect what I'm selling.

They go in a small padded envelope, $1.00 and $2 postage (large letter rate) 

Large value combined orders get registration too.

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Small bubble envelopes can be purchased from sellers on-line for 15c each.

Small bubble envelope - as long as it's under 20mm thick,  can be posted for $1