or if you are happy to have a plain lanyard/holder with you in case they aren't easily available on baord, then take a look at Office Depot or Staples etc.
Next Cruise: P&O Adonia - 20th May 2013
Last Cruise: Queen Victoria - Xmas/New Year
Golden, Grand(2), Caribbean, Sea(4+1 aborted)
Adonia(4), Arcadia, Artemis(2), Aurora(5), Azura, Oceana(3), Oriana(10), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(5), Caronia(2), Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam