I love the clothes styles at Jacqui E. They have a lot of corporate gear which is great for work and occasionally you can pick up a bargain compared to normal store prices.
Approximate cost: $149.95
Great range of quality corporate and professional gear. They also have a range of items for smart/casual wear that you can dress up or down. This store is a factory outlet, so the prices are reasonable. They do also carry some new lines, so it's not all dirt cheap.