LUCKY20
Check out the comparison sites such as Trivago, if RTG is the lowest price, then it's a good deal.
Book a participating hotel before 11:59pm (US Pacific Time) on 7 February 2014 via Ratestogo.com for stays on or before 30 October 2015 and instantly receive 20% off your hotel booking. Limit of one promotion code per booking. Promotion codes are non-transferable, not for resale and not redeemable for cash for any reason. Hotelclub reserves the right to change the terms and conditions of this promotion at any time without notification.
RatesToGo are normally pretty competitive on pricing and I have found them to be easily the cheapest for most places when they have one of these codes. Always compare on Trivago or Hotels Combined as mentioned by Shaw.