Quick look through keepers who haven't played/made less than 3 appearances (and their club has a reasonable 3rd keeper) for Championship clubs this season who would appeal, I've ignored younger keepers without a first team appearance as I'd hope we'd be getting in someone with experience.
Jack Bonham at Stoke (170 career appearances including 70 plus appearances for Gillingham at this level)
Alex Palmer at West Brom (Spent last season on loan at Lincoln)
David Marshall at Derby (550 career appearances)
James Shea at Luton (200 career appearances)
Jordan Smith at Forest (60 career appearances)
Neil Etheridge at Birmingham (250 career appearances)
You have others like Jordan Archer (QPR), George Long (Millwall), Ben Wilson (Coventry), who have barely featured but seem to be the benchwarmer and may not get let out if the club doesn't trust the third choice.