enlarge Fred Field / Staff Photographer

A hot selling Jacoby Ellsbury bobblehead in the Sea Dogs gift shop Friday November 9, 2009. Demand is booming for memorabilia from former Sea Dogs who played in the World Series.

enlarge Fred Field / Staff Photographer

John Kameisha of Yarmouth displayed a hot selling Jacoby Ellsbury jersey in the Sea Dogs gift shop Friday. Demand is booming for memorabilia from former Sea Dogs who played in the World Series. Kameisha is Sea Dogs executive vice president.

enlarge Fred Field / Staff Photographer

Maybe you think they’re tacky, or all that jiggling makes you a little dizzy.

Here’s something to clear your head: the Jacoby Ellsbury bobblehead dolls that the Portland Sea Dogs couldn’t give away at Hadlock Field this summer are selling on eBay today for up to $50 a pop.

A baseball bearing 27 Sea Dog signatures, including that of Ellsbury, fetched $135 on eBay recently.

This morning a jersey Ellsbury wore on a Sea Dogs road trip sold for $612 – without an autograph. Ellsbury, 24, who will likely patrol center field in Fenway Park next year for the Boston Red Sox, leads a parade of former Sea Dogs who are hot commodities in the baseball memorabilia market. As soon as the Sox clinched the World Series in Colorado Oct. 28, prices jumped for cards, baseballs, bobbleheads and game gear from former Sea Dogs like Ellsbury, Jonathan Papelbon and Dustin Pedroia.

“They win the World Series and stuff starts flying off the shelves,” says Kevin Ryder, a Pawtucket, R.I. resident who deals in New England sports memorabilia. “Red Sox Nation, they’re crazy.” Ryder says the World Series victory created a national demand for collectibles from players who were previously well-known only in New England, at least during their minor league days.

He’s been fielding orders from Texas, Florida, California and, notably, Oregon, where Ellsbury played college ball at Oregon State University. “I sold a bunch of bobbleheads out there,” Ryder said.

Simon Thompson, a 15-year-old high school student in Portland, has been collecting Sea Dogs autographs for three years and is an experienced buyer and seller on eBay.

“The value of cards has gone up considerably, but the tricky thing is that some players’ prices will stay at the higher price, while others will go back down again,” Thompson said in an e-mail interview.

He said prices for Ellsbury trading cards have held steady throughout the year, an indicator that these cards will likely hold their value over the long run.

A card for Ellsbury called the 2005 Bowman Sterling Autograph Jersey Rookie Card had been worth about $50 but jumped to $120 after the World Series, Thompson said.

Clay Buchholz, a former Sea Dogs pitcher, raised his profile when he pitched a no-hitter for the Sox on Sept. 1, but he did not make the World Series roster, so his values are less certain, Thompson said.

“His autographs sold for as much as $60 in the middle of the season,” he said, “but are down to around $20 now.”

At Hadlock Field in Portland, the Sea Dogs are also reaping the benefits of former players’ popularity. The Ellsbury jersey that went for $612 on eBay was actually sold by the team.

Executive Vice President John Kameisha said the Sea Dogs have been selling game-worn jerseys for years on the team’s own Web site but decided to use eBay this year because it was easier. Kameisha said it’s not uncommon for a jersey to sell for $300 to $500, so he wasn’t sure whether the World Series had seriously influenced values. But he acknowledged that there’s a demand for goods.

The Sea Dogs recently brought in a new line of Ellsbury T-shirts, priced at $20 apiece in the team’s souvenir shop, in response to customer demand, Kameisha said.

Also in stock at Hadlock are the coveted Ellsbury bobbleheads, which began life as a disastrous mistake.

Ellsbury is a lefty, so he wears his fielder’s glove on his right hand. But when a shipment of 1,000 of the dolls arrived in Portland last spring, they had their gloves on their left hands.

Kameisha said the team obtained new, correct bobbleheads in time for the game day promotion at Hadlock, but the Sea Dogs were stuck with the 1,000 error dolls. As it turns out, the error dolls have become something of a collector’s item because of Ellsbury’s popularity.

The Sea Dogs are selling them for $15 each now in the souvenir shop, and online buyers are paying $20 to $50 apiece to dealers who are reselling them on...