I just got a redkite one from Amazon, £35 it was. My lo likes a firmer mattress so he's alright with the insert that comes with it x
FB marketplace is a good place to look, I guess then you can then Google the brand to see if it’s good etc. My mum got one basically brand new for £20 xx
Also red kite, was £50 in Argos and doubles as a playpen 😊
We got a tutti bambini cozee go I think it is. Was £100 not the cheapest but it’s so much bigger that others so will last longer and is a play pen too which will come in handy. The mattress is also soft I found cheaper ones to be uncomfortable for her x