also with your spare furniture put them in the local paper to sell you wont have to move them then
how big is the tv? might get $50
at my garage sale a few months back sold a few things
sold a few 68cm tvs for $50, also sold 1 of those massive 60" flat screen rear projections for $435 i though it was only worth about 300 depends what others want to pay
i sold 2 queen beds with mattress for $100-$150 each they were snapped up in minutes
Agree with selling instead of storage, although I think it's optimistic to think you'd get $50 for a box when they're free off the kerb or Gumtree (probably obsolete in 1 or 2 years anyway) .
As for the mattress, I'd be getting a new one, and if Kim is happy to use hers after various tenants, then she'd be OK with buying a good used one, from a clean household (you can obviously see where one has come from when you buy) cheap, if she sells the one she has now.