Does anyone know where I can find a new cot mattress, crib mattress, or lounge chair cushion for under $30? I want to set up a bed in the back of the Explorer, but I’m having no luck finding anything small enough that’s also reasonably priced. Even a 1" thick camping pad is like $40. I can get a complete cot WITH a memory foam mattress for about $60, so it should stand to reason that the mattress alone can be had for like $20, right? But I just can’t find one for that sort of price.