Shoespie offer a wide selection of choices, at very reasonable prices, no tax and no shipping charges (they even pay shipping if you have to send them back).
Their site is nice because you can sort by size, style, color, price, etc. all at the same time (for example, white dress shoes, with a 2" heel, size 7, under $100).
Also, once registered, you generally get pretty good deals monthly (like 10% off sandals, etc).
http://www.shoespie.com/C/Sandals-c1-101403/