Stud welder wanted? I'm your Man! Sorry I had to do it.
I got mine at Offshore auto body supplies. I believe they even have them at Princess Auto. Not sure on pricing as I got mine years ago.
I own one- stud welder is good... the studs they sell kinda stink and the slide hammer is horrible.Harbor Freight has them
If you have a MIG welder, you can try what I used to do before I got a Stud welder. Try grinding the points off of a 6 pennt steel nail and tack welding it in the dent. Then pull on the nail and cut/grind when done. It doesn't work bad.