Here is an idea using 2 free wood pallets partly dismantled and angled.
I personally would have used a 2 board crisscross method to secure the angle and create extra support  instead of the single board here. I do love the idea and from my experience of using a sawbuck, I am 90% sure this would work.

http://www.arboristsite.com/firewood-heating-wood-burning-equipment/154493.htm

What is a Saw Buck ?
Read here: http://en.wikipedia.org/wiki/Sawbuck

 photo credit