Now that Christmas has come and gone and you've collected all of your gift cards and certificates -- or perhaps need to exchange that unidentified gift from your crazy aunt -- it's time to browse the post-holiday sales.

Many stores are offering deals and discounts for shoppers to take advantage of the day after Christmas on Wednesday. Major retailers including Macy's, Target, Kmart and Walmart are even offering up to 75 percent off select merchandise to entice shoppers on Dec. 26.

Here's a roundup of the best after-Christmas sales, arranged alphabetically, both online and in stores.

Aeropostale: 60 percent off the entire site on 12/26

Amazon: 40 percent to 70 percent off savings on everything 

Best Buy: Galaxy Note II marked down to $249.99, Samsung 46-inch LED 1080p HDTV for $579.99, the Insignia 39-inch LCD 1080p HDTV for $279.99, LG 24-inch LED 720p HDTV $179.99

Big Lots: 50 percent off Christmas merchandise 

Costco: Computers up to $500 off, TVs up to $800 off, Cameras up to $900 off

Crate and Barrel: Up to 60 percent off holiday merchandise, furniture, home accents, kitchen, bedding, lighting, etc. 

Dick’s Sporting Goods: Up to 60 percent off apparel, $15 off athletic shoes, 50 percent off Reebok apparel, 25 percent off Nike apparel. All deals good from 12/26 until 12/29

Dollar General: 25 percent off Christmas baking and candy items, 50 percent off Christmas merchandise

Forever 21: 50 percent off sale items with coupon code HOLIDAY50 until 12/31; Free shipping on purchases of $50 or more; Last Chance Holiday Deals starting at $1 

JCPenney: Free shipping for purchases over $50 online 

Kmart: 4-Day After-Christmas Sale: 60 percent off clothes, 60 percent off home merchandise, extra 50 percent off toys already on clearance, 50 percent off Christmas items, up to 50 percent off holiday storage items, fitness-related merchandise on sale 

Kohl's: 15 percent off with coupon code COUNTDOWN until 1/1/2013, Early Bird specials in store on 12/26 until 1 p.m.

Limited: 50 percent off total purchase with coupon code GIFT50 online until 12/27

Macy's: 50 percent off with coupon code JOY, extra 15 percent off and get free shipping online with a $99 purchase during the Week of Wonderful After Christmas Sale

Radio Shack: $20 off purchases of $125 with coupon code SAVE20, $10 off every $50 purchase, Free ground shipping for purchases over $50 online, 60 percent off toys, $50 off iPhone 4S and iPhone 5 with 2-year contract, Samsung Illusion marked down to $99.99 from $149.99 

Neiman Marcus: 25 percent to 33 percent off already marked-down merchandise

Saks Fifth Avenue: 70 percent off from 8 a.m. to noon on 12/26 online and in stores 

Sephora: 20 percent off sale items with coupon code EXTRA20 at checkout online, expires 1/2/13; free 3-day shipping for orders over $50 

Sports Authority: 20 percent to 80 percent off certain items in-store and online until 12/30

Staples: 65 percent off online and in stores until 12/29 on TVs, cameras, computer equipment and other consumer electronics; free shipping online on all orders with no minimum purchase 

Target: $10 gift card when you spend $75 

Tommy Hilfiger: 30 percent off total purchases online with coupon code THILSALE until 1/6/13

Victoria’s Secret: Semi-annual sale begins 12/26 online, starts in stores 1/2/13; free shipping for online orders with coupon code SHIP100, 40 percent off sleepwear and bras