These custom-made biochar kilns are crafted by Ellicott City artist, Bill Knapp, in partnership with EcoWorks. The first photo shows the actual product design. The additional photos show the making of biochar from woody material (in a different style kiln), you can learn more about the process here. 
 
The cost is $430. The pre-order sale is 50% deposit of $215, which will be followed up with an additional $215 invoice. 
 
Product design is 16'' square at the bottom and 32'' square at the top.