Updated

In a twist to the U.S. housing crisis, a family that has been living in a home built inside a cave in suburban St. Louis has put it up for sale on eBay.

Bidding starts at $300,000.

Click here to see photos of the cave house.

Curt and Deborah Sleeper of Festus bought about 3 acres of property and a cave in Festus in 2004, after they spotted it on the Internet.

The couple built a three-bedroom home inside the one-time mining cave.

A large payment is due soon, and the Sleepers are trying to secure private financing. If they are able to, they may not sell. They're not accepting financial donations.

Their youngest child, Theodore Wesley, was born at their home over the weekend.