Flooring Underlay (Crossmyloof, G41)

Hiya :) Does anyone have any leftover rolls of underlay suitable for laminate/engineered wood flooring?
I have been let down by my builder quite a few times so I have become Queen of DIY and trying to do as much as I can myself before Christmas and going to fit my bedroom floor next weekend and hoping I can source some underlay - it's a small room - I think 6m2 would be enough!
Thanks so much xx
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