Cheryl, Blue Springs Red Racks and our New Shawnee Mission City Thrift stores both sell factory fresh box springs and mattresses.
They do not have them often due to health/sanitary issues
Hit and miss. Run by and check
There are no beds in stock this week. You might check online or places like Craigslist
It varies as a thrift store the inventory is always in flux. They have almost anything you might own in life.
My neighbor has one that she's asked me to "cart off"
Sometimes they have those in stock
Thanks! Your answer is awaiting moderation.