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The days are heating up, and so are the deals. Today's best online bargains include 50 percent to 75 percent off floating coolers, freezing water bottles, cozy hammocks, and stylish Adirondack chairs. Other sizzling sales include custom Macbook covers, two-for-one concert tickets, and a best-selling Hoover, as well as window dressings for a penny and an offer from Sam's Club for Costco card holders.

Courtesy of amazon.com

$39 BEST-SELLING HOOVER SPRINT QUICKVAC BAGLESS UPRIGHT FROM AMAZON

Why we love it: Amazon's $41 price drop on this bagless best-seller drops the price by 51 percent, making it a no-brainer for anyone in the market for a new vacuum.

Related: Best Upright Vacuums Under $150

Courtesy of Cheapism

$10 OFF CREST 3D WHITESTRIPS AND 1HR. EXPRESS WHITESTRIPS FROM COSTCO

Why we love it: An instant $10 manufacturer's discount at Costco makes this combo $7 cheaper than the lowest price on Amazon, and $10 cheaper than Walmart's price for the 3D Whitestrips alone. That's something to smile about.

Courtesy of eddiebauer.com

$6 FOR 32-OUNCE FREEZER WATER BOTTLE FROM EDDIE BAUER

Why we love it: Eddie Bauer's 50 percent off clearance includes a number of water bottles, including this model equipped with a freezable gel insert to keep liquids cool when the mercury rises.

Courtesy of tanga.com

$10 MACBOOK CASE AND KEYBOARD COVER FROM TANGA

Why we love it: With 11 colors to choose from for six models of Macbooks, Tanga's deal on stylish and protective covers offers a budget solution for anyone looking to put the “personal” back in “personal computing.”

Courtesy of jcpenney.com

BUY-ONE, GET-ONE-FOR-A-PENNY CURTAINS FROM JCPENNEY

Why we love it: JCPenney's Buy-One, Get-One-for-a-Penny sale translates to roughly 50 percent off a wide range of styles in any size or color stocked by the store. Use coupon code SHOP3 for an additional 25 percent off online orders and save even more with free shipping on orders over $99.

Courtesy of walmart.com

$9 OFF INTEX MEGA CHILL FLOATING COOLER

Why we love it: Walmart's rollback on the ultimate surf-and-sun companion drops the cost to just $13, making it the best price online by $7. With six built-in cup holders and enough capacity to hold 72 cans and ice, a hot summer suddenly looks a whole lot “cooler.” Look for in-store pickup to save at least an additional $5 on shipping.

Courtesy of Cheapism

$80 COLEMAN ROADTRIP SPORT CHARCOAL GRILL FROM SHOPKO

Why we love it: Shopko's discount on this tailgating tag-along takes $20 off the regular price, making it cheaper than the next best offer at Walmart by $10 -- and it includes free shipping.

Related: Best Grills Under $250

Courtesy of Cheapism

75% OFF EVERGRN DOWNTIME HAMMOCK FROM REI

Why we love it: A deep discount from REI brings the price of this sofa-style hammock down nearly $100, to just $32. Spend $50 to qualify for free shipping, or use the online locator to find a location for in-store pickup.

Courtesy of wikimedia.org

FREE SAM'S CLUB ACCESS FOR COSTCO MEMBERS THROUGH THE FOURTH OF JULY

Why we love it: Costco card holders can size up the savings at Sam's Club with a bid to tempt loyal Costco card holders to jump ship with free access through the Fourth of July.

Related: Costco vs. Sam's Club

Courtesy of thinkgeek.com

60% OFF EDDARD STARK IPHONE 6 CASE FROM THINKGEEK

Why we love it: ThinkGeek is knocking $15 off its exclusive, licensed “Game of Thrones” iPhone case (or $30 off a similarly-themed iPad cover). The clasp may or may not be forged from Valyrian steel, but a magnetic clasp and built-in pockets for storing a couple of cards add some function to the geek-factor form.

Gary Glaser/shutterstock

2-FOR-1 TICKETS FROM TICKETMASTER

Why we love it: Consider this two-for-one ticket deal from TicketMaster a consolation prize for those not getting a pair of free tickets as part of the recent class-action settlement. Shows and locations are limited, but include marquee performers such as Demi Lovato, Chris Isaak, and Blue Man Group.

Courtesy of Cheapism

$80 FOR CORAL COAST BIG DADDY RECLINING ADIRONDACK CHAIR WITH PULL-OUT OTTOMAN

Why we love it: A $200 dollar discount from Hayneedle takes 70 percent off the regular price and includes free shipping. The built-in retractable ottoman adds an extra dimension of leisurely lounging.