Just out of interest for those near the Nottingham area, Harry Tomlinsons Bonsai Nursery in Nottingham Forest sells Akadama for Â£12.50 for 14 Litres and is able to sell in larger bags on request. His website is
He is also selling 2 litre bags for Â£3.95 which could be a handy size for nano's. They also sell a set of 3 stainless steel scoops with graduated sieves for Â£16.00 as well as a really nice Stainless bonsai manicure set including curved scissors and pincette tweezers which are very high grade and similar to the ADA tools.
Just to state, i have no connection with Harry Tomlinson other than being a previous bonsai customer.