Collectors and card companies are giving him more stock to sell

Diamond kids: Nine-year-old Brady Kahle (left) has raised more than $7,000 selling his baseball cards and other collectibles for the family of his friend Landen Palatino (right), who has brain cancer

There's only one thing nine-year-old Brady Kahle loves more than sports - and that's his friends.

That's why the young man didn't think twice about selling off his prized baseball card collection to help pay for brain cancer treatment for his little league pal, Landen Palatino.

'I have so many baseball cards that I wanted them to go to a good cause,' Brady, of Springfield, Massachusetts, told Today.com on Friday. And there's no cause better than a friend in need.

Baseball card collecting has been a part of Brady's life for six years, when grandpa Jon Kahle introduced him to the hobby at the age of three.

Regular visits to Springfield's monthly Cards and Collectibles Show helped the boy build up a 500-strong collection of cards, posters and signed photographs.

But for the past two shows, on February 7 and March 6, Brady has been there for a different reason: he's been manning his own stall and selling off his beloved collectibles to raise money for Palatino's family.

Brady started raising money for the Palatinos after overhearing his parents talking about how Landen's mother, Tina, had to take unpaid breaks from her job so she could take Landen to daily treatments at a hospital an hour from her home, MassLive reported.

Landen has glioblastoma brain cancer and had a Grade IV tumor - the fastest-growing and most malignant of all tumors - removed from his brain in January.

Calling his stall 'Cards for a Cause,' Brady has so far collected more than $7,000 for Landen's treatment - enough to relieve some of the burden from Tina.

Fighting together: Landen's mom, Tina (center, with Landen and his sister Audrina), had to take unpaid time off work to take Landen to his daily treatments. When Brady heard about this, he stepped up to bat for the family

A good cause: Brady's 'Cards for a Cause' has attracted support from all over the U.S. - including from the Red Sox, who invited him and Landen to join a special ceremony on April 21

Brady's mom, Jessie, is rightfully impressed by her son's generous spirit. 'It's unbelievable to see the work he puts into it, she told Today.com. 'He takes it very seriously and stays up late sorting cards.'

And Brady's team spirit has caught on with others: Cards for a Cause has received donations from collectors and card companies and the widow of baseball great Roberto Clemente called to congratulate him.

But the most exciting news for Brady is that the boys have been invited to Boston's Fenway Park for a special ceremony hosted by the Red Sox on April 21.

'It was crazy when I got that call [from the Red Sox],' Brady said. 'This has been a dream of mine for forever.'

Brady has also been featured on the website Kids are Heroes, which highlights young people who are effecting positive change in the world.

But it's back home that the young man's generosity has really had an impact.

'At first Landen didn't understand why Brady would want to give up his cards,' Tina Palatino said. 'But after we talked about it... My heart just melted.'

A GoFundMe page was also set up to raise money for the Palatino family. At the time of writing it had raised $15,710 - more than 100 times its original goal of $1,500.