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I checked this, large envelope about $2.50, $6.70 for priority 2day. Either are cheaper than buying from Tesla. Also find it a waste to throw it away when other people clearly want one.
Just wish I would have remembered during delivery since there were 2 other deliveries happening when we were there.
Fyi for those interested, I mailed my cable out for $2.41, would have been cheaper if I would have grabbed a different envelope that I didn't see until it was too late. This should give you an idea if shipping is worth it to you or not.