If WNNN work for you, go with it.
The ones I use are Hollow Oak night nappies and Flutterby Fluff Nights. FFNs are a PITA to get hold of due to limited slots available (not being rude to Hanna at all, they are like gold dust and just as precious
). Hollow Oaks are reasonably easy to get hold of. Just PM Emma S here.
But, they are both significantly more expensive than WNNN - £20+ a shot.