I made my own from a Makita chainsaw chain!! It works a treat, I haven't felled any trees as that isn't the way I do things, but I've cut downed trees for fire wood and it ripped through the wood like there was no tomorrow. I used a dremel to remove two links of the chain by grinding off the pins, this gave me two useable lengths of chain and I put paracord through the holes where the pins were linking the chain together. I just wrap the paracord around two sticks I find on site to form handles and cut away.
If I was at home, I'd post pictures, it wraps up and fits into an old plastic shoe polish tin!