CINCINNATI - People trying to sell their prized possessions these days are finding that - as with homes or stocks - the market value of everything from baseball cards to antique furniture has sunk.

Across the country, collectibles dealers and antiques appraisers are delivering bad news, and feeling pain themselves. The reason is simple: potential buyers are outnumbered by desperate sellers.

That's been dashing dreams of an "Antiques Roadshow" moment in which the TV show's hosts appraise family heirlooms many times higher than the owner expected.

In suburban Chicago, Ron Anderson put his treasured 1985 Bears' Super Bowl game ball up for sale online through Craigslist.

"Instead of sitting around and worrying about things, I thought I'd do something," said Anderson, whose construction contracting business is down. Anderson priced the ball, which was autographed by the late Hall of Fame running back Walter Payton and other stars, at $4,500, figuring he'd draw interest from wealthy Bears fans.

He was still waiting for an offer a month later.

From an antiques auction house that caters to wealthy residents of Palm Beach, Fla., to an Ohio pawn shop with a blue-collar clientele, similar stories abound.

Families trying to unload keepsakes for cash are learning that an economy at risk of falling into a deflationary period is taking a heavy toll on the value of these assets, just as it is for traditional investments such as stocks and homes.

Pam Danziger, who studies consumer behavior as president of Unity Marketing, said people who start collections often make a mistake by considering them an investment. And that leads to disappointment when they try to sell them to people who don't share their emotional ties to the items.

"Even if things are 100 years old, it doesn't necessarily mean they're rare or valuable to anyone else," she said.

While experts generally agree that demand remains high and prices good for very rare and top-of-the-line items, the market for mid-range and lower-quality collectibles is down sharply.

"The majority of items have a value under $10,000, and that's the material that's been hit the hardest," said Mike Gutierrez, a sports memorabilia expert for Heritage Auctions in Dallas.

The online auction company eBay Inc. recently reported its fourth quarter earnings slid 31 percent, although its number of active buyers and sellers grew nearly 4 percent to 86.3 million. Even with more users, gross merchandise volume - the total amount of money that flows from transactions on the site, excluding vehicles - fell 12 percent to $11.5 billion.

At an auction business in downtown Cincinnati that has been around since around the Civil War, owner J. Louis Karp warns clients they face "a terrible market."

He recently told customers to expect $300 to $400 for a sterling silver flatware set. "They said, 'Oh my God! It retailed for $1,500!"' Karp recounted.

A Persian rug Karp would have sold for up to $5,000 just a few years ago will now go for $800 to $1,500.