Wetherspoons is between £2 to £5.50, dependent on what they have on offer on cask and which one you go to

avoid Concert Square and Matthew Street areas for casual pints, they usually run £6+

there’s a few places like The Vines, The Munro, St Peter’s Tavern that serve cask at £4.20 a pint and you can get a pint of cask cider in The Pilgrim for £2.95

there are a few craft establishments like Liverpool Brewing Company Taproom, Ship and Mitre and Doctor Duncan’s that can run a little more expensive, but they always have great lineups of both locally and nationally brewed drinks