There are just too many sins and promos for me to list for this one.
If you're considering the RnR Las Vegas Marathon or Half Marathon, I suggest checking out their "7 Deadly Sin" promos. Those who register on a certain date, gets entered into a drawing to win that date's prize.
To see which sin you might want, click here.
Those who register on 11/2/10 only, gets $20 off. Code: SINFUL