I recently made one a couple months ago, Apex 5.0 from thru hiker and ripstop seconds from diygearsupply plus cords, cord locks, Velcro, grosgrain, thread, etc.
All in all, the whole project cost me $75 including shipping. I used the bare minimum of fabric to make the quilt. I bought 3 yards of the 72" wide roll, and cut it in half to get two 54x72 sheets but ended up buying a yard of left over ripstop from local store for cheap to add length since I'd lose some to seams.
Depending on height, you can save money by buying 5 yards of 60" wide ripstop instead of 6, or do what I did with the 72" wide roll. I probably could have gone without adding extra fabric to increase length since I'm only 5'6", but I'm happy with how it turned out.