Where can I get cheap quality rectangular shapes eyeglasses?

[bifocal glasses]

I found that rectangular shapes eyeglasses frames are especially popular those day, many celebrities and pop stars love to wear such style eye wears, which may convey in wearer’s apparel, shoe, and handbag, always reflect the entertainer's lively style, or a metal frame that comes in beige or claret is also very popular, these kinds of eyeglasses frames have a petite fit and a pressed striped design, but the price of eyeglasses nowadays is not beyond everyone’s reach, where can I get cheap but quality ones?