I did some digging around and, after reading many reviews, picked up an Edimax BT-8500 for $16 USD on Amazon (because it wasn't cheaper on newegg and I'd expect a counterfit version on eBay or other sites). Anyhow, I was able to flash the latest InifiniTime on a brand new pinetime with this new bluetooth adapter that just arrived. Others please share what works or what doesn't work for you.
This bluetooth adapter was tested successfully with siglo on Arch linux.
This bluetooth adapter was tested successfully with siglo on Arch linux.