Kneeling chairs can be expensive. Make your own to your exact body measurements.
Featured Products - Sit Kneel Chairs
Wooden kneeling chair - Ergonomy Great chair, from your friends at ergonoffice.com
I think I need to buy me one of those kneely-desk-chair things...
Ergonomic Kneeling Chair Mid Century Danish by HearthsideHome
Amazon.com - Flash Furniture Mobile Wooden Ergonomic Kneeling Chair in Gray Fabric - Desk Chairs
Wooden kneeling chair - Assembly drawing and parts list
Photos - Best Kneeling Chairs
kneeling chair design plan - Поиск в Google
Anonymous; Kneeling Chair by Artifort, c1970.