Just like you as a referee I've tried many score sheets over the years. Seriously Great Cards Will be using these from now on Referee's Dream AAAAA++++. There's no need for wallet, although they have been designed to sit perfectly on one side of your referee wallet if you prefer.
Football Soccer Referee Score Cards Notepad : : Everything Else
Match Pad (Coloured) – REFSTORE
Football Soccer Referee Score Cards Sheets Pad Record - Will fit in a wallet
RefStuff RefScorer
rules - What do the referees write during the matches? - Sports Stack Exchange
Referee Match Day Pads (Total 50 Sheets) – East Point Sports
RefSwallet
Soccer Referee Cards, Quality Equipment
Mudder Sports Referee Card Set Red Card Yellow Card Libya
RefStuff RefScorer RefSwallet COMPACT Football Soccer Referee Slimline Pocket Wallet Notebook with Red and Yellow Cards and 2 Match Day Record Game Cards
Football Score Sheet - UK