Keeping The Costs Down When Staying In Hotels

For those of us who have to stay away from home in hotels either on business or for pleasure, we know just how easy it is for costs to add up. So here's my list of how to keep those costs down to more manageable levels. 

1. Make room bookings as far in advance as you can to benefit from cheaper rates
2. Booking online is almost always the cheapest way
3. Pay using a card that doesn't attract an extra charge
4. Go for the cheapest rate that means you can't make any changes once you have booked (if you need flexibility them pay for it)
5. Don't be tempted with all the add-ons for meals etc. (it's this up-selling that makes the hotel chains lots of money)

Of course there are lots of other ways to keep the costs down. What would you recommend?