The set was around $290 shipped: Velocity A-23 Rims, Ultegra 6700 hubs, DT Swiss spokes & nipples. Retensioning will cost me around $100 for both wheels, but the seller refunded me a little bit to defray the cost after I complained to them (without the seller's help, it would have been $130).

As an aside, these wheelbuilding machines look like they're expensive.