might want to spell out your system and air flow now so others can better aide you. 30quid isnt alot for FANS these days hell I just spent 180$ for 6 ML fans last month.
Looking into getting some fans for my phanteks eclipse p400 to improve temperatures any recommendations dont want to spend anything over £30.00.
I use EK Vardars in my case I have no complaints with them and they are £16 each
Have they dropped in price? not bad at all, still slightly over his budget though. Definately a good option considering the airflow they provide even when not used as a rad fan.