Thanks for the offer @gonetropo, you're a top bloke. I popped down to Para Rubber this arvo (looks like Clarks is the Aussie equivalent, @Dicko). Yeah, they had heaps, but heapest option (a bunch of offcuts) was gonna cost me $50+. Sorry, but that's just silly. Will keep my eye out in secondhand stores etc. for an old cot mattress or something.
Sorry for the sloppy grammar in the original post leading to some misunderstandings...!
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