How to do it...

I need like 500 milk jugs.
And I can't think how. I'd like them within a week.
I'm pretty sure it's super illegal here to dumpster dive.
But... maybe I'll go drop off some recyclables, and pick some up while I'm there. Like a switcheroo. In broad daylight. But if I recall, they have lids on the dumpsters.
Think, think!