a pair of these will run you around $130.
for a cheaper alternative i suggest checking out a equestrian apparel store, like http://www.chicksaddlery.com/ they sell women's rubber riding boots that cost $36.99. Here's how they look like:
PROS: since its made from rubber it will wear well, minimal upkeep, and will last you a very very long time! hence the investment in the $130 Aigles for some people may be worth it (i myself am contemplating this!). It also looks much more stylish than the rain boots or the wellingtons when paired with skirts, tights, leggings, skinny jeans, dresses...and also because it's rubber, it will obviously protect your feet from getting drenched.
CONS: depending on how big your calves are, it may be too tight to wear with jeans. always check to see if there are bigger calf sizes (i know aigle has varying sizes).
in the end i think equestrian boots are long lasting, classics that will never go out of style.