The Australian builder is listing the retail price as $850 AUD, which works out to about $620 in US. I don't think the price has been set for the US, but West Coast Sailing is showing an estimated cost of $650.
As far as shipping, I think it will be an oversized item. I've mailed-ordered a Radial spar before, and I believe that is just under the limit for what UPS considers oversized. Probably not so for an upper mast section.
edit - Upper spar is 142", Radial lower is 89" and the UPS limit is 108" for standard shipping.