Here is a list of shopping tools that can save you money and time.
These are sites I've used myself and was happy about using. Please let me know if you have additions or suggestions.
The suggestions fall into several main categories: Deals, Price Comparison, and Phone Apps.
Deals:
 Woot: Interesting New Deals Each Day Woot: Interesting New Deals Each Day
 http://wwww.woot.com
 http://deals.woot.com
 
 Ben's Bargains: Coupons, Bargains, Freebies Ben's Bargains: Coupons, Bargains, Freebies
 http://bensbargains.net
 
 Slick Deals: Community-Driven Discounts, Reviews & Comparisons Slick Deals: Community-Driven Discounts, Reviews & Comparisons
 http://slickdeals.net/
 RetailMeNot: Coupon and Promo Codes for Just About Everything RetailMeNot: Coupon and Promo Codes for Just About Everything
 http://www.retailmenot.com/
Price Comparison:
 Bountii Bountii
 http://bountii.com/
- DealTime http://www.dealtime.com/ http://www.dealtime.com/
Phone Apps:
 Red Laser: Scans Bar Codes, Then Finds Best Prices Red Laser: Scans Bar Codes, Then Finds Best Prices
 http://redlaser.com/
- ShopSavvy
Honorable Mentions: Other Resources Worth Checking









This is a great list and I’d like to add a category: cash back sites. I like http://www.lilideals.com because they offer coupons (like retailmenot) along with cash back percentages as high as 25% (varying according to retailer). You can combine offers which can ultimately make for a much better deal. LiliDeals also gives you a head start on your cash back reward by giving you $5 just for signing up (you get $5 for each of your friends too).
smartphone barcode apps:
Android barcode generator
iPhone barcode generator
http://www.onbarcode.com/products/android_barcode/
http://www.onbarcode.com/products/iphone_barcode/
great post