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Anywhere - been looking on line, all the shops on-line - the sizes are different, can find mattress too small and too big for the bed.
I have now realized that Ikea (online) do various mattresses to fit this bed. The one that has come with it - is so uncomfortable = its like laying on the concrete - no comfort at all. Even buying a memory foam topper didnt seem to help - maybe they like laying on concrete over in Norway/Sweden where Ikea originated from.