PORTLAND – Mary Jane Newell and her husband have sold their boat, their lakeside camp and even her Harry Potter book collection. Now up for sale: Newell’s offering her Elvis collectibles on Craigslist.

What’s next? Maybe her Stephen King collection.

“I don’t think we’ve ever had it this tight since we had little kids running around way back in the ’60s,” said Newell of Oxford, who’s retired along with her husband, Stanley. She’s a former nurse; he’s a former Bureau of Motor Vehicles office supervisor.

The Newells expect their heating bill to triple this winter, and they’re not alone in unloading items. Rising fuel prices, higher food costs and concerns about the economy are contributing to a sell-off of goods online, in pawn shops, in consignment shops and in yard sales.

In Westbrook, Cathy Haley hoped to pass a diamond engagement ring on to the next generation. She has a secure job as an office manager, but a prolonged child-support dispute and the rising costs of raising her two daughters prompted her to offer the ring on Craigslist.

The $1,500 she hopes it will fetch will go toward heating oil.

“I’m keeping my fingers crossed,” she said.

The number of customers coming in to sell items at Maine Gold and Silver has been growing since the beginning of the year, said John Colby, vice president and part owner of the South Portland-based business.

People tell Colby they’re selling items to pay down debt or to make ends meet.

“We’re hearing heating oil, and the heating oil season hasn’t even started. The other day, we heard someone say food,” Colby said.

Meanwhile, Richard W. Oliver, an appraiser and auctioneer, said he has been receiving more requests for house calls to evaluate antiques and fine art.

Oliver, who works out of Wells, believes attitudes about passing items to future generations are changing. The sellers aren’t necessarily facing dire financial circumstances, but may want to maintain a certain style of living, he said.

“Basically, I think they’re rethinking things in the economy and saying, ‘I could really use the money now. We need the money to take care of ourselves rather than leaving it to the children.’ A lot of that has changed,” Oliver said.