From the review I posted here in BGG for this game -
Sargonkid'a Review of Police Precinct wrote:
Cards – I have a large stock of different kinds of card sleeves – however, I had a hard time finding the right size for the larger decks. I ended up using some “defective” Mayday Sleeves that I got for a stupidly cheap price (2000 of them < $20.00) – and they worked great, as they were too wide and tall for them to sell normally, but worked great for these cards.
Is it possible they still have some of the these "defective cards"? They were called something like "Penny Pak" - I just checked and don't see them ATM - however, I have noticed they pop up now and then.
Edit - here is the actual Name/Part# on MDG I used to order them - not listed atm.
Ultra-Fit™ Card Sleeves - 2.5 x 3.5" - 100 Pack - “Almost-A-Penny”