The NBA is auctioning a jersey worn by Jason Collins during their game against the Boston Celtics on March 7, 2014. In case you've been living under a rock, Collins is the first openly gay active NBA player, who first took the court post-coming out in February. Proceeds will benefit GLSEN and the Matthew Shepard Foundation.

From the NBA's auction site:

The NBA and MeiGray Group Game-Worn Jersey Authentication Program is proud to offer fans and collectors across the globe the opportunity to own a piece of history … the jersey worn by #98 Jason Collins of the Brooklyn Nets throughout the Nets' 91-84 loss to the Boston Celtics on March 7, 2014 at TD Garden in Boston, MA.
Collins, who dressed for the game but did not play, autographed this jersey on the back #9 of his #98 after the game."3-7-14" is handwritten on the jock tag.
This black jersey, a size 3XL+4 inches of extra length, is registered into the NBA and MeiGray Game-Worn Jersey Authentication Program as number BKN00404.

The price as of April 14 was $820. The auction ends April 22.