Yeah, well good luck with that! They are RARE and fetch a premium. You may be able to build up a set piece by piece but it's going to be slow and expensive. Having said that I picked up a near complete set at a militaria fair for a song. I don't think he really knew what he had.
You mentioned that your friend is putting together a PAF pilot's tunic and he needed the buttons. I have three id'd Polish Pilot tunics in my collection and only one of the three has PAF buttons. The other two have the standard RAF buttons. With that said I have an acquaintance that has a full set of PAF buttons. Last time I saw them they appeared to be in mint unused condition. If your friend still is interested I do not mind making an inquiry to see if they are available. But as Shide noted, I don't think they'll come cheap. Let me know and I'll check, if there is an interest.
hiya mate, thanks for doing some digging for me, but my mate is gunna leave these ones, hes convinced the bloke doesnt want to sell them that much so doesnt want to rob him of his treasures! but the hunt goes on! if you hear of any more single ones or sets please dont hesitate to let me know, thanks alot mate take care
"They shall grow not old as we that are left grow old,
Age shall not weary them nor the years condemn,
At the going down of the sun, and in the morning
We WILL remember them."