Sent 4 balls from Wisconsin. The base fee was $55 and with a declared value of $1000 there was a $5 insurance charge added. So it ended up being $60 each way. Well worth not having to deal with the hassle of take them on the plane.
al_g is correct, shipments are automatically insured for up to $500, anything with a declared value over $500 will be charged extra insurance. I believe the it costs $1 per every extra $100 insured.
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I've been lucky long enough...now I'd like to get good.