http://l2.espacenet.com/dips/viewer?PN=US4085145&CY=gb&LG=en&DB=EPD (http://l2.espacenet.com/dips/viewer?PN=US4085145&CY=gb&LG=en&DB=EPD)
how much more expensive?
About 2.7 times more expensive, according to my calculations (ouch).
Most likely putting it out of reach considering the already high cost of PdCl2. Admittedly I haven't checked the mole ratios, but 5g RhCl3.xH20 will cost around €600. Still, there is never any harm in posting new methods; somebee may have access to plenty of the stuff, and when PdCl2 becomes unavailable, we'll have to find some other way!
By the way, it's the 200th anniversary of Rhodium's discovery next year. I hope you have something special planned, as I've just noticed it's the same for both Osmium and Palladium too! See
http://www.outfo.org/science/chemistry/elements/listing/discovery_year.html (http://www.outfo.org/science/chemistry/elements/listing/discovery_year.html)
:)