It's a daunting task at best, but my hope is some will chime in with their tips (other than using someone else's Corp. Code!). I'll start:

1. Set aside waaay more time than you think you'll need at the computer with the fastest internet connection available.

2. Check the Special Offers page at the property you want.

3. Check the AAA and Senior rates (when Senior rate is substantially lower, I've had success calling the front desk manager to match)

4. Use Special Offer Code LTO109 - I've found a couple properties use this limited time offer code even though it's not listed on their special offers page. (*edited to add that LTO110 now seems to come up automatically*)

Of course, we're not mentioning the added value of DEL5k or Delish, etc.; or calling the property directly to match a competitor's rate. Any other tips?