If Toronto stays out of it, Ernie Clement.
Slightly below average offensively, but above average defense at 3B. 1627 innings at 3B, B-R has him at +25 defensive runs saved above average. Got moved to 2B when they signed Okamoto and Toronto also has Addison Barger.
A .700 OPS isn't anything to write home about, but it's a lot better than Rengifo/Hamilton. Only ~10% K rate on his career. 30 years old, so he is what he is. Not a FA until 2029, so they can keep him until two of Williams/Pratt/Made are ready and then flip him.
Also looking at Texas - if they stay out of it, one of Josh Smith or Ezequiel Duran. Pretty much the same player profile as Clement, but slightly younger.
If TOR and TEX get back in it, Nick Gonzales of PIT. Already 27, hasn't broken out, don't know if he's in their long-term plans, but could use a change of scenery. Not a FA until 2030.
All four would cost a little more because of multiple years of control left, but once two of Williams/Pratt/Made are ready they can flip them for assets.