There's a reason the US goverment declassified Aermet...it did not work.
Almost every Aermet frame I've ever seen (or built with) has broken. There were more builders that worked with Aermet than what has been named but most only built a frame or two.
Generally, the material was very brittle, often snagging and chipping during mitering, was terrible for ductility, and often resulted in mid-tube cracks and/or failures within a few months.
I agree, one will be rare to find, as most were returned and placed in the scrap bin.
cheers,
rody