I know this is the first site where I saw them mentioned. I just purchased one to 'save my back' even though I am still ailing with a bulging disc at L5. Figured it was time to make it easier on my back as I push 40 and am almost 1 year ahead on wood. I liked this design the best...should be here next week...
http://cgi.ebay.com/24x-CRADLE-FIRE...in_0?hash=item3ef8577fab&_trksid=p3286.c0.m14
http://cgi.ebay.com/24x-CRADLE-FIRE...in_0?hash=item3ef8577fab&_trksid=p3286.c0.m14