There's a place downsouth that used to send me boxes of them, but apparently they are not available in UK.
You can google 'Countdown nz Goldilocks scourer' and you will find them at NZ$7 for a box of 2 = £3.70.
I am trying to get in touch to get sone sent over here.
Nothing compares to these, they are so worth paying extra for, not so harsh, work a treat, last for ages n ages. Best value, best quality - long term. Hope this helps!