The waiver route is the only reliable way to get talent at this point. Anything else is a lottery ticket. The teams to keep an eye on for putting legitimate talent through waivers are teams that bought on July 31st and fell out of it in August. Bonus points if they're near one of the LT thresholds or if they have a player in his walk year making good salary but not worth a QO.
So IMO the team to keep an eye on is Texas. They're right at the LT line, have 9 pitchers who are impending FAs, and currently have 35% playoff odds.
The Angels and Reds were surprise buyers at the deadline, and another month of not making much traction could push them over the edge too. I think for the Reds especially Nick Martinez and Emilio Pagan each have pretty healthy salaries, they'd save $4-5M if they dumped both of them in a few weeks.