There's even a slight mileage discount for flights up to 2,000 miles each way. (travelcodex.com)
If you have lots of bookings to make I recommend booking flights up to 100,000 miles now and placing a hold on other flights. (awardbookingservice.com)
You can use these points to buy flights up to any value, just as you would if you pay cash. (millionmilesecrets.com)