IRUN brokers for GUNBROKER.
Have a friend put colt mags on at a certain time - list them "clip thingies' under 'taxidermy' so no one will see them and you can buy them.
Then have IRUN bring them in, pinned.
You get lowest price colt mags in history, legally.
Your Welcome
That would work with any 'Legal' item. Have a friend source it..lots of gun shows down there in the states. And put it on Gunbroker.
The only risk is, if someone else starts bidding.
I might do that next time I'm offered New Hampshire LE SIG 229's for $300.