We thought we would buy a foam mattress now. Ikea do a double one
> 200x140x10cm for £60. Is this a good price or could we perhaps buy a
> thicker one elswhere for the same money? Also we are wondering if 10cm
> is a bit thin, although we do prefer a firmer mattress and we use a > mattress pad.
If it is 'foam' it will lose its springiness and quickly.
Only mattress of this type that lasts is Dunlopillow. And you won't get one of those cheaply.