Your best bet is to try. Check out, for example,
http://www.betterbidding.com/ as an example of how to proceed. They'll tell you how to go to PL, check out what's available for your dates, match hotel zones and star values, etc., and maybe go for the 60% off. (But be ready to accept what you bid on, just in case the price and star level is accepted!) You'll be able to get a sense of what's available and price as you go through the process over several attempts, if you do it yourself.
You might also consider hotwire as an option, if they have anything $ and * that looks good.
Good luck.