I have had great success with Zenni Optical. I have purchased repeatedly. My last 2 pair were rimless stainless glasses with progressive bifocal, anti-reflection coatings, and photochromic lenses. The quality of the edge polishing is better than on any I have had made locally. Inexpensive for what you get.
I did break a titanium frame at the bridge, once. But with rimless glasses, stainless doesn't add enough weight to consider titanium. I have no experience with their cheapest products.