These kits are made by Obtronix.  These appear to be very nice quality.
I will be replacing the plastic A3 and A4 PROM chips with 6301-1J ceramic chips that I have already had programmed.  Note also that these kits include the DIP sockets!  These were not included in the Obtronix kits (at least not mine).
UPDATE Apr.11.2010:  Increase the reliability of the ACI by replacing the .01uF filter capacitor with a .1uF capacitor - see Mike Willegal's detailed analysis and conclusion here.
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