Last I checked, Murray's has them for pretty cheap. When I last went up there, I found them for 25.00 a piece. Also, if you need some support soon without having a bar in the way of your working area....clamp some vice-grips lightly, but snugly onto the silver part of the strut just before the black part...and the hood will stay open perfectly. I have been doing this, and just keep a pair of vice-grips in my car because I'm a cheap bastard.
i just use a short piece of round wood and stick it right beside one of the hood struts to hold the hood up. it works very well, its out of the way and not as noticable as putting a large object at the front to prop up the hood.