Amazon have a great deal on their Fiskar's 3 Piece Rotary Cutting Set. It's $52.32 but there should be a 15% discount that applied at checkout. It comes with a 18" x 24" Self Healing Cutting Mat, a Rotary Cutter and an Acrylic Ruler. The mat alone costs $45.50 at Spotlight or ~$40 at Amazon US.
About this item
Classic Stick Rotary Cutter features a rolling 45 mm blade that cuts multiple layers and holds fabric flat for accurate, straight cuts without jagged edges
Extra-large 18 inch x 24 inch Cutting Mat features an easy-to-read measuring grid and a self-healing, double-sided surface for lasting value
6.5 inch x 24 inch clear Acrylic Ruler lets you see where you're cutting and includes highlighted seam allowances for strip cutting and a grid for simplified shape cutting