Still some out there. Searching for 'aluminum wedges' also brings up a lot of small wedges, which look like they are intended for demolition work, or leveling large machines. And some pretty expensive felling wedges ($30-$80 each!!!).In my early days of woods work there were aluminum wedges available, my dad had a few but the got beat to death and forgotten, sold by Oregon I think.
Found these (also sold individually on Amazon):
Grandview Aluminum Products - http://www.gapalum.com/chainsawwedges.html
Some look heavy to carry, but affordable enough for me to forget casting my own!
I'm waiting for the Ted photo / videos!That system does not work well. One can only use limbs and must be cut semi parallel to grain going length wise
Philbert