Henessey's don't often go once people have them - and when they do they don't often
go for a lot less than you can buy a new one for - given that a new ultralite is about 185 bucks at MEC or REI, and the standard model is 140 or so.

If you can afford that - I'd just order me up a new one. If you can't, You can save a fair bit by making one. , Risk's Site and several others have instructions. You also might consider posting to the Buy and Sell gear section here that you are interested in one - someone might be shriking their closet and sell you one.

If you do try to make one, don't overcomplicate it - a hammock is a pretty easy thing to
make. (I use a homemade speer type)