I received a response from Marvic today, so here is their most current pricing for their magnesium Gr4 rims:
Pantera Gr4 10"x15"...1,900 Euro each
Pantera Gr4 14"x15"...2,100 Euro each
Freight they say will be around 500 Euro for the set of 4 wheels to the U.S. with a 10 week delivery from purchase order. 30% up front at order, and the rest of the balance is due when wheels are ready and before shipment.