If you're in the States, Zappos all the way! I've ordered dozens of pairs from them and their service is top of the line, bar none when it comes to online shopping - absolutely no hassle and free shiping on returns. You can narrow your search by style, color, heel height and then sort by price. Prices range - but you are generally getting really good value for your money.
Aldo (in UK) sandals are to die for...they even have a sale on now. I think they have stores abroad but check out their website - you might find something you like.