But, there are free services that will save you time and money.
Elizabeth Renn saves hundreds and hundreds of dollars on clothes, shoes, and accessories, all thanks to Shop It To Me dot com.
"It's my favorite website right now," Renn said. "It's kind of like an online personal shopper."
Shop It To Me has a list of more than 500 brands. Pick the ones you like as well as the kind of merchandise you're looking for, say pants and dresses, then specify your sizes.
Shop It To Me will search cyberspace for sales that match your request then email you what it finds either daily, or just once weekly, depending on your preference.
"There's really no reason to pay full price anymore, because you have your eye on something and as soon as it goes on sale in your size, you'll know about it that morning," said Renn.
You buy directly from the retailer by clicking through the "Shop It To Me" email.
Charlie Graham founded Shop It To Me and says the average discount the service finds is 42% off regular prices.
"We've now grown large enough that, for some of our retailers, we have exclusive sales," Graham said. "So we have sales in our email that you cannot find anywhere else. With all of our partnerships, because we have these relationships with these retailers, we know all the different deals and coupons that go with it."
If you're looking for sales on items other than clothes and accessories, check out Deal Alerter.
This is a personal shopper for all kinds of merchandise including toys, sporting goods, and video games!
It works a lot like Shop It To Me. Tell Deal Alerter what you're looking for and how much you're willing to pay by setting up a Price Alert. Then the website will notify you when it finds that item in your preferred price range.
Here's a helpful hint. The experts at Shop It To Me have analyzed all their sales data and figured out that if you shop on Thursdays and Fridays, you'll find the highest number of new items on sale at the biggest discounts.
Click for SHOP IT TO ME
Click for DEAL ALERTER