Ending today, Hotels.com cuts up to 50% off select hotel stays. (Click the "48 Hour Sale" banner at the right of the page.) Plus, activate coupon code "REBATES12" to take up to $100 off select hotel stays via a mail-in rebate. (A minimum of three nights is required to redeem the rebate.) Combined, that beats last week's mention, which only took up to 30% off select stays initially, and it's tied with our July mention as among the best percent-off discounts we've seen from Hotels.com in recent months. Some restrictions may apply. Book by today for stays through September 24.