Where can i find chicago bulls shorts the N.B.A players wear?

My 13 year old cousin is a M.J. fan and wants bulls shorts. I gave him a Jersey already. I know that in north Texas Jcpenny and Macy's sell Macs short but only Mavericks shorts and Jerseys. So I was wondering in Chicago do they sell bulls shorts at Jcpenny or Macy's or is there a place online I looked on N.B.A.COM a.d could not find any