I could get you small buttons for use on your cuffs and a couple of large buttons for the front of the jacket, maybe 4-6. I have lots of the small ones on shirts that need exchanging, but not too many large buttons I'm afraid. Tell me exactly what you need, I may be able to help.
What i have done is ordered a couple of manky s95 jackets, to cannibalise. Hopefully they will have the correct buttons etc, in which case i will most likely be okay. But hold the thought, in case i have been ripped off..