Hi, I've bought an arms reach co-sleeper on eBay after seeing loads of great reviews but need to get a new mattress (you need a new mattress for each baby right?). Just wondering if anyone knew of a good place to get one from. I've had a bit of a look online and not many places seem to sell them in the UK. Plus the mattress seems a bit plasticy - is that right or should I get something else for on top of what it already comes with? Any ideas much appreciated