Hello............Can you get coins without swapping or buying?

Yes you can, one way is metal detecting.

Thats all right, but how to make a small and mini metal detectors!!!!!!!!!!!!!!

Thanks a lot in advance to one who gives me the idea!!!

http://www.bbc.com/future/story/20130222-scratch-and-sniff-mine-detectors

This might help

http://m.wikihow.com/Build-a-Metal-Detector

Easiest way I know, is for people who travel around the world, is to give the coins they get to you.
You get the coins and they remove excess weight from their pockets.

Quote: "Hello There"​This might help
​
​http://m.wikihow.com/Build-a-Metal-Detector

​@Hello There---Thank you!!! It's amazing!!! I have already made it.!!!
Kind Regards!!!
@COINMAN1--- Yes, I liked your idea so much.