Not the cheapest but still pretty decent, only downside is having to actually spend the initial $50, however, if you are going to purchase other stuff from JB it doesn't really matter.
Purchase the $50 gift card, get 20% off your next purchase. Use the gift card and have $10.80 left over to spend on whatever else.
Cheers
$39 delivered from eBay local.
http://www.ebay.com.au/itm/GOOGLE-CHROMECAST-DIGITAL-MEDIA-S…