+1
or moving companies have folks that construct packaging on the fly. They have wood and can package anything. You can have it done, just for a set of speakers... but it is expensive. For instance about seven or eight years ago I was going to send some speakers... it was over $500 to fabricate crates... and they were not large. So shipping them... was over $1,000 (crate plus fright). They were probably only 40 lbs each.
I made a couple runs at it and gave up.