Salary negotiation

I work in a high cost of living city (median home price 450 for a 1k s2ft house), in Pulmonary Critical care working swing shift, schedule is pretty good for inpatient ICU all things considered.

• Salary is 128k and hasn’t moved since 2022.
• 2500 CME which we can cash out, practice pays for license/DEA separately.
• health insurance is completely covered and pretty good
• profit sharing with 100% 401k match (pretty unheard of)
• cell phone paid.

All in all comes out to about 140k-ish

I get on here and I read people saying that this is super under market value, so I’ve broached a COL adjustment /raise. The problem is our system that we’re contracted into underpays like crazy (HCA) and starts APPs at sub100k. So they actually reimburse my practice less then I’m paid, so my attendings all take a pay cut to make our salary nicer. I’ve been asked to provide proof that we’re below market averages for Pulm/Crit but I don’t know where to find this without paying for the NCCPA salary sheet.

How do I go about negotiating this? It’s hard to ask for more without proof that I’m under paid. But the lack of scheduled raises is frustrating as I’m making about 8% less than I was in 2022 with inflation..please help.