May be a bit of a long shot but does anyone know where I can buy some foam padding to put on top a mattress, got a guest staying for a while and they can't get away with the hard mattress so thought the extra padding may help.

Thanks.

I used to find them at Big C (Chiang Rai).

Found what I needed in Tesco 3' wide by 6.5' deep 699 baht picnic mats if anyone else is looking for them