You might give Zeal Optics a try (zealoptics.com). I used them for my last pair of prescription shades, which were also my first non-insert specs. I found the company to be very easy to deal with, and I've been quite happy with my glasses.
You might also consider the selections from your local optometrist. They may have some brands (e.g. Oakley, Bolle), and can order stuff as well. My optometrist is a runner, so she had a pretty decent assortment of brands, YMMV.
BTW, if you can swing it, opt for dedicated prescription lenses over inserts; the fogging problem others spoke of is real. I rode my (insert) Bolles for years, but once I made the switch (to non-inserts), I'd never go back.