You all should walk through car parks and steal them off of all the cars. Maybe you could even sell them back to their owners without them knowing it.
"Sir, may I interest you in an England car flag?"
"Well, I've already got 5. One on each of the four windows and one on the sunroof."
"Actually, I believe some skinhead came through and stole them."
"Oh the nerve. Fine, how much?"
"?5 each or ?20 for 5."