Sofa bed mattress dilemma

[cajunpedaler]

This may or may not have anything to do with upholstery, but since there is a wealth of information here...
I have a queen sofa bed.  Of course it came with the usual and super crappy mattress...so miss smarty pants (me) ordered a new one from Amazon...good price, great mattress...Fits width and length perfect.  (basically the size is what's called a short queen in RV's)

Here's the problem.  It's too thick to fold up and go inside the sofa frame.  Doesn't even fit under the inside back.  It's a 4.5" mattress and I think that's way too much.  Probably a 4" would be better.  Any ideas where to look besides Ebay or Amazon?  I don't want to spend a huge chunk of money.  I paid 150.00 for this one and it's a fair price.

Or is there a foam insert I can put inside the mattress framework and store the mattress when it's not in use? 
Thanks.
Perry

[SteveA]

Have you considered the link at the bottom of this page - click "latex mattress" - worth a look
SA

[Darren Henry]

I've only ever seen one of those mattresses that wasn't like trying to sleep on a pillow case full of tuna cans.

is there a foam insert I can put inside the mattress framework and store the mattress when it's not in use?

That could be a bit of a pain ---finding storeage room, moving it around when needed etc...I would suggest just making a 4" foam mattress and cover and selling the new mattress to try to get some of the money back. I've swapped out the el-cheapo foam in my camper(s) with decent 2.2lb density foam and it is very comfortable to sleep on. I would try closing the hide-a-bed with a sheet of 4" foam in there just to make sure you have room for it. Even if you had to go down to 3" I'm sure it would be quite comfortable because of the "trampoline" in the sofa bed.

[kodydog]

Check this out,

http://www.ebay.com/itm/like/231574186642

[sofadoc]

Check this out,

http://www.ebay.com/itm/like/231574186642

So how would that one work?

Would she have to take it off and store it when she isn't using it? I don't see that one folding up in a sleeper mech. She already has a 4.5" mattress that is too thick to fold up.

And you can't sit on the sofa cushions unless there is a mattress folded up inside.

Seems like it defeats the purpose of having a sleeper sofa if you have to store the mattress elsewhere.