Haggling over a car price isn’t always a bargain. There are head-scratching discount offers and long waits while salespeople check with managers, among the many horror stories.

The angst has spawned a small but growing trend toward no-haggle alternatives found at discount club stores, some dealers and on several Internet sites.

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“The goal is less stress, faster turnaround time,” says Alan Ohnsman, a spokesman for the TrueCar.com car buying site. “The whole experience is easy, quick, painless, smooth.”

When buyers use TrueCar, they get a bell curve of sales prices reported by dealers, plus three discounted price offers on the car they want from dealers in their area. They can make the deal through the website, then travel to the showroom to fill out papers and pick up the car. Ohnsman says people do have the option to take the dealer offers and bargain, although he says prices offered through the site are typically the lowest available.

TrueCar, founded in 2005, makes its money on fees paid by dealers for sales. It made more than 610,000 new- and used-car sales in 2014 and expects to pass that when 2015 figures are announced. Still, it accounts for only about 4 percent of annual U.S. sales to individual buyers.

Other sites, such as Edmunds.com, also offer a form of no-haggle pricing with offers from affiliated dealers. And a handful of dealers across the country have a no-haggling option.

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Another big player is retail giant Costco, which has doubled the number of cars sold through its no-haggle auto program in the past five years. The program, run under contract by San Diego-based Affinity Development Group, is promoted at Costco’s 488 U.S. stores.

The program monitors prices and makes sure Costco members get sufficient discounts through more than 3,000 car dealers nationwide, said John Conlon, the warehouse chain’s director of services.

Costco members bought 465,000 cars through the program last year, up almost 17 percent from 2014, he says.

Estimates are that more than 90 percent of new car sales in the United States include some haggling. One reason: Buyers fear the no-haggle price isn’t the best deal, says Edmunds.com analyst Jessica Caldwell.

Steven Szakaly, chief economist for the National Automobile Dealers Association, counters that research shows people get better prices by negotiating with dealers.

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And he contends that most buyers end up finding the dealer experience more pleasant than expected, after complaining initially. Otherwise, he says, they wouldn’t keep coming back.