I'll try to summarize the best deals I found, as the numbers under each provider are bound to confuse. First of all, all the providers handle exams differently. If you simply need an eye exam and a check of your glasses prescription, that exam is entirely free at any of the VSP providers. If you are getting lenses for the first time, however, things get more complicated. If you already wear disposables and want to continue them, go see Dr. Moore for a prescription and buy them through WalMart.
Frames are all different prices, and lenses are pretty variable.
Where I've seen the frames, I've indicated below. If you want polycarbonate or high index for bifocals, prices go up accordingly. The person I spoke with was very unclear about pricing of all products and services, and what she did tell me wasn't as good a deal as other options. Nonetheless, they have a large selection and often have special deals and coupons that bring prices down. Maybe she just got lucky, but it's worth a try.