From the Linkwitz Lab web site:
For DIY budgetary purposes consider that the minimum material cost for the ORION project, including tax and shipping, is approximately $3700, without power amplifiers.
Construction Kit $350
Tweeters (4), Midranges (2), Woofers (4) $2100
Cabinetry $500
ASP crossover/equalizer $650
Cables, interconnects etc $100
Power amplifiers (12x60w or 6x180w) $1835
If the speakers were sold through the normal distribution channels, the retail price for the complete ORION system would have to be over $22,000.