Opportunities to redeem points at flat rates for award travel are dwindling. In early April, Wyndham Rewards switched to an award category system, much like Marriott Bonvoy and Hilton Honors, getting rid of its flat 15,000-point-per-night price for a free stay. Free stays at Wyndham properties now vary from 7,500 to 30,000 points per night,... Meghan Coyle is a writer at NerdWallet.