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Investing in You - How to hunt bargains like a pro

There are savvy shoppers. Then there are holiday crazies - expert, rabid consumers who combine coupons, compare online vs. in-store bargains via smartphone, and put us all to shame.

Edgar Dworsky, proprietor of nonprofit consumer advocate Consumer World.org, is among the latter.

Here's what he does before buying anything, most especially during this season of shopping insanity, along with tips from some other parties:

Chart price history. Start by visiting sites like Shopping. com, Shop.pricespider. com, Pricegrabber. com, and TheFind. com, as well as Google Shopping, Amazon. com , and eBay. This year, the Wall Street Journal has launched a "Christmas Sale Tracker" on 10 popular items that updates constantly. WorthIt.co alerts shoppers when prices drop.

"Sometimes, what seems like a good deal today really isn't a good deal vs. six months ago," Dworsky says. "Also, read negative reviews and horror stories. There are lemons out there, so do your homework online."

Reviews can be found at sites such as BizRate. com, ResellerRatings. com, Consumer Reports, or PCMag. com.

Combine savings. Let store credit cards, coupons, loyalty programs, and promo codes work for you. Try CouponCabin. com and RetailMeNot. com, coupon apps you download on a phone.

Assuming you're not creeped out by the Minority Report overtones, RetailMeNot's app tracks your physical location to send relevant deals. Walking by Old Navy or Macy's? The app senses your location and sends you a coupon.

"There's no clipping, no carrying paper coupons around, and you can also save these coupons on your phone. RetailMeNot will alert you when the coupons expire," says Trae Bodge, a RetailMeNot blogger in Montclair, N.J.

ShopYourWay. com is a loyalty program for Sears and Kmart that Dworsky uses to buy appliances. "If you're renovating a house, you can rack up a lot of points buying all your appliances from Sears," he says, "and maybe get 2 percent back if you use a Sears credit card."

Check for rebates. Just prior to buying, Dworsky checks with Ebates. com or Fatwallet . com to see whether those sites will pay cash back for purchases at major retailers such as Sears.

"Prices on Kenmore appliances, for instance, are typically inflated," he explains, "so it's a great way to get extra savings."

Take credit. For the love of money (say, fraud, security, and repair costs), don't shop with a debit card or cash. You have everything to lose by using debit cards, and cash payment doesn't offer warranty extension or returns protection.