I was looking in the garden section of a local OSH and saw this stuff called Gel2root made by SupaPlants in the UK. It's a nutrient gel that you put your leaf cuttings into. Unfortunately both the Gel2root and SupaPlant websites are under construction or unavailable but here is one site selling http://www.ferndale-lodge.co.uk/pd_574090.htm so you can get an idea of what it is like (I am not endorsing the site or the product having never used it).
Here is a description I found on another board (via Google) that was lifted from the Gel2root website prior to the new construction:
And finally some http://planterspride.ca/en/products_gel2root.php on the product on www.planterspride.caOriginally Posted by [b
It looked like some ready made tissue culture media to me, but planterspride says: "It is not suitable for hardwood cuttings or ericaceous (acid loving) plants such as azaleas and rhododendrons."
So I guess this stuff would be unsuitable for CPs?