Aim is a good place to buy old police/military import/trade ins.. There are a couple dealers on Gunbroker as well that sell a lot of police import/tradein Glocks, CZs, HiPowers, Barettas and others.. Just spend a few weeks doing some searches and figuring out who these guys are and then decide on a price you want to pay.. When they pop up be ready to click the "buy" button, anything that is worth it goes fast.