I tend to use premade laminating sleeves rather than full sheets, whenever possible. It is easier for me than cutting smaller items out of a full sheet laminating sleeve: some paper items shift around during the lamination process, which removes any nice even lines I could have used to trim them to a particular size. The sleeves are all perfectly sized!

One can get laminating sleeves for business card-sized paper, and there are even poker-card-adjacent sleeves (look for military ID sleeves without the prepunched hole).