I just purchased 3 pairs of glasses for myself just before Christmas from zennioptical. All three are excellent quality. I got the memory titanium frames & love them - the frames are very light weight.
"Fitting" - unless this is the first time wearing glasses, it's not too hard to fit them to yourself. Sometimes a minor adjustment on the bridge, and that's about it. Simply measure your current glasses to know the width & length, and order online. My 3 pairs, which included the sunglasses (polarized) clip-ons came to $60.
A nice new feature on their website is that you can upload a picture, mark the centers of your pupils (and you need to know the distance from pupil to pupil to order glasses anyway). Then, trying on glasses is as simple as clicking the try-on button. One thing that I noted is that when I try them on at the optometrist, I don't know what they look like, because they don't have lenses in them = I can't see myself in the mirror. The computerized "try-on" is very accurate (in my experience of the three pairs I've purchased.)
I can't see how glasses for me could be of any better quality, thus more than $25 or so a pair is throwing money away.