Salam! I'm a fellow Muslima living in the US. Although it is increasingly popular to dress modestly in America, a lot of the prices are still very high! I feel we should not spend extravagant amounts of money on clothing when many of our Muslim brothers and sisters do not have enough to eat. Islam encourages the least but sufficient. Spending less on clothing leaves more for sadaqua! If you have any websites/stores feel free to comment :)
Here's a cute outfit that I discovered while browsing forever21.com. I was inspired by the tunic and built the outfit around it. It's both modest and pretty, great for dressy-casual. The whole outfit (not including flats) cost around $60.