Around 9am is when they typically announce any daily offers (Ladbrokes did a £25 refund on a particular race every day last time but didn't announce it until the day). Also I always make sure I am watching the daily ITV preview prog @ 9.30 (on ITV4) as they have the latest info on the runners and a Ruby Walsh tip can effect the prices. You do need to be keeping a close eye on the Cheltenham Forum (either OM or PA) as a lot of offers get posted on there (unfortunately with a lot of inane rubbish chat as well)