Hi J,
Perhaps ask a local Celestron or Skywatcher dealer, they may have them as promolotional giveaways from the manufacturer or indeed try the manufacturer directly, perhaps via the
livechat or tech support option on the webpage below
https://www.celestron.com/pages/support
or perhaps via twitter... (somehow)
https://twitter.com/celestron/status/662732987331555328
Best
JA