Evingar is correct in his assessment of prices. I think that about 50 Dominos have been made so everything has to be bought in small volumes. This is much more expensive than buying in the huge volumes that are common for consumer equipment.
My own work is largely concerned with designs that will be manufactured in 100s. My clients and I look enviously at the cost of components for 1000s. I'll feel ill if I find out about 100,000+ prices.
Malcolm is certainly not making much profit on each Domino. Even if his time is given for free.
Richard Russell makes a newer test card generator. It can be programmed with many patterns using a PC. I have seen it working at 625 and it's a nice little unit.
http://www.cix.co.uk/~rrussell/