This is product sold at Amazon.com - north American market. It is a pet door and it accommodates cats and dogs to 25lb.
The discount is very substantial. I tried to check what other sites sell this product for and failed to get a cross check.
Taking what Amazon say on face value and as true this is a 57% discount on a nice product:
List price $175.50 - discount price: $75.85. Click on the image to go to Amazon.