I finished the dining room chairs I was reupholstering; will have a photo here sometime, technology permitting.
The vinyl that I wanted ended up not being on sale, so the total cost was about $20, plus some staples for the staple gun. I only needed one yard of vinyl for the two chairs. Mostly the process was straightforward. The tricky part is gathering in the vinyl at the corners...the secret seems to be to make a series of tucks with the fold lines hidden underneath the seat. The backs were also attached in a way that took me a few minutes to figure out.