Carpet or underlay offcuts (Cogges OX28)

Bits of unused carpet or underlay needed please.

I have a rug 160 x 230 that is a lot thinner than I hoped and I want some bits of (unused) carpet or underlay to put underneath it to make it a bit comfier. Doesn't matter what it looks like or if it's lots of small bits but it does need to be unused.

Does anyone have anything that might do the trick please?
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