Added 24 Feb 2018 -
Apparently the Cooks kitchen appliances are sold (new) exclusively by J. C. Penney. I still have not found a replacement lid for your pressure cooker. I suggest you call J. C. Penney Customer Service: 800-322-1189. Ask about the availability of a replacement lid for your pressure cooker.
So you need to find and purchase a replacement lid for your pressure cooker. That pressure valve which broke off the lid is VERY IMPORTANT.
Do you perhaps mean it is a Cook's Essentials pressure cooker? Cook's Essentials cookware (new) is sold exclusively by QVC.
First, check the user manual for your pressure cooker. It may contain a phone number or web address for replacement parts or service.
If you have no manual or there is no information on a source for replacement parts or repair service, and if I am correct in thinking yours is a Cook's Essentials pressure cooker, then, I recommend you contact QVC Customer Service and ask about the availability of a replacement lid for your pressure cooker. This is the link to QVC Customer Service:http://www.qvc.com/content/information/customer-service.html?viewType=gallery&pageSize=96