If you have an older infrared style 3D Panasonic TV circa 2011 and earlier, this may be the cheapest way to get some cheap 3D glasses. Note these are not Panasonic, but the XPAND brand which have great reviews in general.
They are $10 each at amazon.com
Amazon link: http://www.amazon.com/dp/B006PC6U7O
Link to manufacturer
http://www.xpand.me/shop/panasonic-3d-glasses-1-pack/panason…
Shipping to Australia is $10, and $3 for each additional pair.
Thank you so much. Ordered 3 for my HP Evny 17 3D laptop. It seems they are exactly the same glasses.
http://3dvision-blog.com/4381-hp-envy-17-3d-shutter-glasses-…
It's a kind of universal 3D glasses.
Compactible devices list:
http://www.xpand.me/compatible-devices/