Have you ever ordered glasses online? Right now there are so many deals floating around that you can get a pair for pretty inexpensive, which takes the pressure off them having to be perfect. I recently ordered this pair of glasses for my mom. We both wear reading glasses, and our prescriptions are close enough that we can share glasses. We often lose them, and like to have many pairs of reading glasses around the house.
Firmoo.com has a great deal going on right now, you can order your first pair for free, and just pay the shipping.
I was nervous to order glasses sight unseen, but they make it easier because you can upload your own photos, they have you mark where your pupils are in order to get the scale right, and you can digitally try them on.