Blues -13 is widely available (e.g. Better,
Boylesports,
Betdirect,
stanJames) - those points add up, so worth opening an account.
Stan James have great prices IMO on the rugby and are a must have bookie.
Ulster have 3 homes games left after today (including the midweek game versus Munster), so I doubt they'll be too worried about today. They're 4 points clear of Connach with two games in hand, so another win should see them safe - I'd say they'll have looked at the home games for that. Williams has already said he's going to use the away games to blood the younger players.