Kirkland Signature 3-piece Urethane Cover Golf Balls - 24 Pack - £29.89
Be aware though. I bought these and although they feel fine off the face and give decent distance off the irons, they are substantially shorter than other balls with the driver.
I noticed this when I used them and then saw a couple of reviews that said the same. They just don't perform off the driver.
Bought a pair of these recently and they are exceptional. Go a size up though as usually i'm a 9/9.5 but in these I had to order a 10 in the end. Very comfy and feel very high end quality. The 2 pairs I ordered (had to send the 9's back) neither had any blemishes on them like the description states they might. For the price they are the best shoes I've had in years.