Sofa-bed/Futon - Double Mattress?

Sounds like you are looking to buy a sleeper. A new one of quality will run about three times as much as a good used one. You should find a used on for $200 or less.

If you are asking about health. A sleeper is made to be an emergency bed. It does not offer the support a regular bed does.

Therefore, long term back problems are a possibility.

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