One of the best developments that has come out of the H Cat open source developers movements has been finding the guys at thunderboltperformance.com<http://www.thunderboltperformance.com/>, which is a manufacturer of catalytic converters.
They are extremely friendly to this idea of providing Cat reactors to experimenters, and have a lot of options they can offer us, including integrating different nano-metals in various combinations (e.g. Palladium, Platinum, Nickel), leaving off the insulation around the catalytic converter, embedding heat exchangers in the matrix. It's pretty much just a matter of pressing some buttons, and out comes the product type of E Cat you want. "To get ours going, we just went with an off-the-shelf matrix combination of palladium and rhodium on a metal substrate (300 cells/inch) in a 4" (outer diameter) stainless steel pipe, with an extra 2.75 inches on the incoming side to place some ceramic insulation to prevent back-flash, and with no insulation around the catalytic converter. That was easy for them to make. He'll make those available for $100, and shipping was only around $14 from Florida. It would be easy for him to make this just Nickel, or Nickel and Palladium, or just Palladium; but would require a lead time of about a week or two; and he wasn't sure what the price would be for that kind of custom order." There no excuse to not get your E Cat experiments off the ground now. So writeup your reactor specs and get them in now.