Frontier Airlines EarlyReturns - How do I search for cheap MR flights?

I need ~200 miles before December 31 2006. Where can I find a list of flights out of DEN with price, miles flown, and flight duration? (I'm new to this - I'm sure this is easy if you know what you are doing ...)

The best way would be to sign up for the weekly Wednesday webfare e-mail (Web-Lynx). 200 isn't hard as even a short hop flight generates 500 miles. I've found weekend fares for less than $200 to most US cities at sometime or another.

DEN-PHX fares can often be found for @ $100-118 roundtrip with same day return and lots of flights each day.SLC is also a good option for a mileage run.