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.