Where to look for sales position?

Been trying to get a buddy to get a new job. He is overqualified an under appreciated/paid for the job he has done for his current company. Been trying to get him to switch back into O&G field which he had been in for years but left when the bottom fell out. He is finally to the point where he would make the jump if the right job presented itself, says he hasn't been looking too hard though bc there are not a lot of openings. Any recommendations on a place to look for listings? Figured I would do a little looking and email him some to kick him into gear.