Using a crate now, will get something else later. After setting on a crate for a while, it's hard getting a 67 year old body up. Thank God I don't have back problems.
There is one available at Harbor Freight for $24.99, looks a lot like the Sears one
This one looks cool but I can see it being a little uncomfortable if I need to lean forward often:
I like this one:
I guess if your a skinny guy they may last longer. I am not, so its a fat guy approved chair for me.