If you can't find mailing tubes, check to see if you can find rectangular boxes the right length. Might be cheaper to mail that way, anyway. I vaguely remember reading somewhere that it costs more to mail a tube than a box. If you get really desperate, you can always grab a couple of big boxes at your local supermarket and make your own poster mailers using the cardboard and packing tape.
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If you get really desperate, you can always grab a couple of big boxes at your local supermarket and make your own poster mailers using the cardboard and packing tape.