I used to purchase keyed-alike padlocks from Wilson Bohannan Company,
WILSON BOHANNAN PADLOCK CO. They made a serviceable padlock at a good price. We paid less than $10 per padlock buying them in minimum quantities of a dozen, and that included monogramming the company’s name on the padlock.
Another type of lock, of a more “disposable” nature was the ring lock purchased from Engineering Unlimited,
Sterling Security Systems - Padlocks, One-Seals, Disposable Locks These were used on utility transformers and vaults, and were less than $5 each.
Best padlocks were about $27 each, including removable core.
Different padlocks for different security and access needs.
Maybe one of these will work for you.