I have Superior insurance through TAMU as well. Recently purchased a pair of progressive lenses, all of the coatings they offer, and the frames I chose include a magnetic sunglasses clip on from Walmart. The total for my glasses after insurance was $151. My daughter's single vision glasses with all of the fancy coatings was $111. We are picking them up today, so not sure on the quality and durability yet.
I've purchased glasses from Walmart in the past, and they were just as good, if not better, than some of the more expense options out there, but it's been years. I will try to remember to post again next week after I've worn the new glasses for a bit.