Will they accept your prescription?
I always get my glasses at Lenscrafters. They have stores in most of the major shopping malls.They have Opthalmic Dr offices next to their stores so in case you would need to get an eye exam for a RX then you could,at the same time,and it probably wouldn't cost more than $45 or so.You get your glasses within one hour.
They have a good choice - from hip to very conservative- of course for really low budget, Walmart has Opthalmic centers also in their 'SuperWalmart' stores. NOt sure about the range of styles available there.

Hubby has a very difficult refraction and astigmatism and it can take a week in the UK for his prescription to be made up.

He bought a pair of glasses at Walmart but ordered them on the first day of our holiday as they were not going to be ready for about 10 days. In the event it took 12 days and we were sweating a bit but he was very satisfied with the quality of the frames and the lenses. It worked out about half the price.

He took his own prescription and did not have his eyes retested there. They told him that they would not be responsible if he wasn't happy with the quality of the vision as they hadn't tested his eyes. In the event, he was very happy with the end result. He got photochromatic lenses rather than sunglasses. Good luck !