Eh, there's not really gonna be much out there centre-wise even after a bunch of these bubble teams fall out of contention.
From the bottom teams Chicago, San Jose, Minnesota, Ottawa (Pinto won't be traded), Arizona, and Washington have nothing of interest to offer at centre. Buffalo has Mittelstadt but he's unlikely to move and will have a much much higher price than Monahan. Anaheim has Henrique and I suppose Zegras if you wanna believe he's available but he'll also cost a fortune and is a obvi a much different situation than Monahan. Columbus has Roslovic but he sucks balls and has 2 goals this year. Calgary I suppose has Backlund but he is signed for 2 years at $4.5 after this and you would have to retain for both years which would cost compensation. Plus Monahan is better.
From the middle bubble teams New Jersey, NYI, Nashville, Detroit and St. Louis (unless you're a fan of Kevin Hayes at $3.5 for 2 more years) all have nothing to offer. Pittsburgh has Lars Eller and... Sidney Crosby (could you imagine). Seattle has Wennberg but he sucks as well and Philly has Morgan Frost who could conceivably move but will likely have a high ask and doesn't have the experience that Monahan does.
That's it. Everybody else is surely a contender and won't be selling but rather will be buying. I suppose somebody could make a monster splash and make cap room for a big contract that has multiple years left on it but I'll have to see that to believe it. I'm here for it though, an action packed trade deadline is always fun.
Anyways long story short, no, there isn't any supply. It is in the hands of Montreal, Anaheim, and maybe Philadelphia or Buffalo if they wanna capitalize on Frost or Mittelstadt but those will be different deals with young player premiums. A 1st++ is coming, that's why Vancouver jumped the gun here.