FESTUS, Mo. (AP) — A Jefferson County cave home remains for sale as its owners hope for a higher purchase price than the $220,000 bid offered at a weekend auction.

Curt Sleeper and his wife Deborah have renovated the Festus sandstone mining cave into a three-bedroom, one-bathroom home with 2,240 square feet of living space. Sleeper says he paid $170,000 for the cave when he bought it a decade ago on eBay but has since added another $150,000 worth of renovations.

The couple's auctioneer says the online sale will run for several more days. If bids don't increase, the Sleepers will instead sell the home in a more conventional manner.