I ordered from Zenni Optical, got a pair of backup glasses with 2 pairs of clip on's for $25. They arrived last weekend, I may have self measured my pupil distance wrong, RX is correct but they get me a little wonky.

But showed up as promised, good quality. Interesting note- they are within 25 miles of me but it was actually cheaper to have them shipped than to drive and pick them up. Now that gas prices are going down, probably not so, but still, cheap shipping.