You can get decent high index lenses from them for $60, and they have $10 frames.

I actually got a pair of prescription tinted (as in sunglass tint) aviator high-index frames w/ lenses for about $110.

There was a site, myopticalshop.com that could do high-index rimless for $150, I haven’t checked in awhile, though.

[edit]

So, the rimless frames are $50 and 1.74 index lenses are an additional $129.