Finding M7 Auxiliary Cartridges

Hi All,
I was recently asked by a member about locating a few M7 Auxiliary cartridges.
Thought I'd ask here to see if this is a possibility or a near impossible task.
I know he wants them to finish off a Display in honor of a Uncle who went MIA.
I'm not real familiar with them, so I'll just paste his inquiry below.
Any input appreciated..... :cheers:

"Vitamin pills
Hey Charlie,
Would you happen to know of anybody here in the forums that might have a couple m7 auxiliary cartridges they would be willing to part with. I would like to buy either two singular examples, or two packs of five still sealed. Either way, single or still packaged, I would have two examples to put with their proper launchers. These are the only things I am missing to complete an m8 and an m7 setup. I cannot find anyone anywhere on the internet that have these for sale. I can find plenty of the m3 and M6's, but I can't find any m7 auxiliary cartridges.I have been watching the gun auction sites for a while, but the m7's seem to never come up for sale."