Correct me if I'm wrong, but it seems like only Cali teams spent the big bucks this offseason... (other than that Witt Jr. big extension)
It's really only 2 California teams - the Dodgers and Giants - which have dominated the market. The Padres, Angels and A's didn't do much.
Other than them, the bigger spenders are:
• Royals: 7 free agent signings for $109.5 million and the Witt Jr. extension for $288.7 million
• Phillies: 4 free agent signings for $183 million and the Wheeler extension for $126 million
• Astros: 2 free agent signings for $107 million and Altuve's extension for $125 million
• Diamondbacks: 4 free agent signings for $156.5 million
• Brewers: 7 free agent signings for $52.29 million, the Chourio extension for $82 million and Devin Williams' arb avoidance for $7.25 million
• Reds: 3 free agent signings for $108.25 million, India's arb avoidance for $8.8 million and Maile's extension for $3.5 million
• Cardinals: 6 free agent signings for $107.74 million, Edman's arb avoidance for $16.5 million
• Braves: 4 free agent signings for $35.85 million, the Sale trade and extension ($38 million, no idea how much the trade cost them), Jimenez extension ($26 million) and Pierce Johnson extension ($14.25 million).
• Pirates: 7 free agent signings for $34.05 million and the Keller extension for $77 million
• Cubs: 3 free agent signings for $90.75 million
This doesn't really account for the value of trades, though. The Yankees only made one big free agent signing for Marcus Stroman, but their big splash was of course the Soto trade.