Hotels.com cuts up to 30% off select hotel stays as part of its Labor Day Sale. 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's tied with our May mention as among the best percent-off discounts we've seen from Hotels.com in recent months. (We saw up to 50% off select hotel stays without rebate hassles three weeks ago, since expired.) Some restrictions may apply. Book by September 3 for stays from August 30 through September 5.