This deal from Wowcher
From £39 instead of £140 for a 10-inch tufted memory foam mattress from Onyx Beds – save up to 72%
Get a 10-inch tufted memory foam mattress. 10-inches deep with a layer of responsive M3 memory foam. With a 13.5 open coil Bonnell spring for evenly distributed support for the body. Medium firmness – perfect for side sleepers! With a hypo-allergenic cover – ideal for allergy sufferers. Choose from six sizes (see full details for pricing).